Install and run Jython build

ci/before_install.sh

@@ -3,5 +3,4 @@
 sudo apt-get update -qq
 sudo apt-get install -qq openjdk-7-jdk openjdk-7-jre
 
-before_install="${TRAVIS_BUILD_DIR}/ci/before_install_${BACKEND}.sh"
-[ -x ${before_install} ] && ${before_install} || echo "nothing to run"
+[ -n "$JYTHON" ] && "${TRAVIS_BUILD_DIR}/ci/before_install_jython.sh" || "${TRAVIS_BUILD_DIR}/ci/before_install_nonjython.sh"

ci/before_install_jython.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+pip install jip==0.7
+jip install org.python:$JYTHON
+_JYTHON_BASENAME=${JYTHON/:/.}
+java -jar $VIRTUAL_ENV/javalib/${_JYTHON_BASENAME}.jar -s -d $VIRTUAL_ENV/jython
+touch requirements.txt
+virtualenv -p $VIRTUAL_ENV/jython/bin/jython ~/myvirtualenv

ci/before_install_nonjython.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+cat requirements_python.txt >> requirements.txt
+ln -s $VIRTUAL_ENV ~/myvirtualenv

ci/install.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+pip install jip==0.7
+
+install="${TRAVIS_BUILD_DIR}/ci/install_${BACKEND}.sh"
+[ -x ${install} ] && ${install} || echo "nothing to run"