Adds documentation

[MRG] Adds documentation

examples/demo_lattice.py

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+from camelot import Pdf
+from camelot import Lattice
+
+
+extractor = Lattice(Pdf("files/column_span_1.pdf", clean=True), scale=30)
+tables = extractor.get_tables()
+print tables
+
+extractor = Lattice(Pdf("files/column_span_2.pdf"), clean=True, scale=30)
+tables = extractor.get_tables()
+print tables

examples/demo_lattice_fill.py

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+from camelot import Pdf
+from camelot import Lattice
+
+
+extractor = Lattice(
+    Pdf("files/row_span_1.pdf", clean=True), fill='v', scale=40)
+tables = extractor.get_tables()
+print tables
+
+extractor = Lattice(
+    Pdf("files/row_span_2.pdf", clean=True), fill='v', scale=30)
+tables = extractor.get_tables()
+print tables

examples/demo_lattice_invert.py

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+from camelot import Pdf
+from camelot import Lattice
+
+
+extractor = Lattice(Pdf("files/lines_in_background_1.pdf",
+                        clean=True), scale=30, invert=True)
+tables = extractor.get_tables()
+print tables
+
+extractor = Lattice(Pdf("files/lines_in_background_2.pdf",
+                        clean=True), scale=30, invert=True)
+tables = extractor.get_tables()
+print tables

examples/demo_lattice_rotation.py

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+from camelot import Pdf
+from camelot import Lattice
+
+
+extractor = Lattice(Pdf("files/left_rotated_table.pdf", clean=True), scale=30)
+tables = extractor.get_tables()
+print tables
+
+extractor = Lattice(Pdf("files/right_rotated_table.pdf", clean=True), scale=30)
+tables = extractor.get_tables()
+print tables

examples/demo_lattice_twotables.py

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+from camelot import Pdf
+from camelot import Lattice
+
+
+extractor = Lattice(Pdf("files/twotables_1.pdf", clean=True), scale=40)
+tables = extractor.get_tables()
+print tables
+
+extractor = Lattice(Pdf("files/twotables_2.pdf", clean=True), scale=30)
+tables = extractor.get_tables()
+print tables

examples/demo_stream.py

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+from camelot import Pdf
+from camelot import Stream
+
+
+extractor = Stream(Pdf("files/budget_2014-15.pdf",
+                       char_margin=1.0, clean=True))
+tables = extractor.get_tables()
+print tables

examples/demo_stream_columns.py

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+from camelot import Pdf
+from camelot import Stream
+
+
+extractor = Stream(Pdf("files/inconsistent_rows.pdf", char_margin=1.0),
+                   columns="65,95,285,640,715,780", ytol=10)
+tables = extractor.get_tables()
+print tables
+
+extractor = Stream(Pdf("files/consistent_rows.pdf", char_margin=1.0),
+                   columns="28,67,180,230,425,475,700", ytol=5)
+tables = extractor.get_tables()
+print tables

examples/demo_stream_ncolumns.py

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+from camelot import Pdf
+from camelot import Stream
+
+
+extractor = Stream(Pdf("files/missing_values.pdf",
+                       char_margin=1.0, clean=True), ncolumns=5)
+tables = extractor.get_tables()
+print tables