Rewrite schema generation (#1)

* Completeley rewritten schema generation
* Added support for python 2.7 and 3.4
* Restructured testing and build configuration
* Added nested request schemas

This rewrite completely replaces the public interface of the django rest schema generation library, so 
further changes will be needed to re-enable and further extend the customization points one might want.

.coveragerc

@@ -0,0 +1,32 @@
+[run]
+source = drf_swagger
+branch = True
+
+[report]
+# Regexes for lines to exclude from consideration
+exclude_lines =
+    # Have to re-enable the standard pragma
+    pragma: no cover
+
+    # Don't complain about missing debug-only code:
+    def __repr__
+    if self/.debug
+
+    # Don't complain if tests don't hit defensive assertion code:
+    raise AssertionError
+    raise NotImplementedError
+    warnings.warn
+
+    # Don't complain if non-runnable code isn't run:
+    if 0:
+    if __name__ == .__main__.:
+
+ignore_errors = True
+precision = 0
+
+[paths]
+source =
+    src/drf_swagger/
+    .tox/*/Lib/site-packages/drf_swagger/
+    .tox/*/lib/*/site-packages/drf_swagger/
+    /home/travis/virtualenv/*/lib/*/site-packages/drf_swagger/