revert pip version (1.3.1 -> 1.2.1) to avoid AttributeError on Jython. (#15)

AttributeError: 'module' object has no attribute 'O_NOFOLLOW'

plugins/python-build/share/python-build/jython-2.5.0

@@ -1,4 +1,4 @@
 require_java
 install_jar "Jython-2.5.0" "https://downloads.sourceforge.net/project/jython/jython/2.5.0/jython_installer-2.5.0.jar#f98b83fce9669feec69d0a17ee515a20" jython
 install_package "distribute-0.6.32" "http://pypi.python.org/packages/source/d/distribute/distribute-0.6.32.tar.gz#acb7a2da81e3612bfb1608abe4f0e568" python
-install_package "pip-1.3.1" "http://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gz#cbb27a191cebc58997c4da8513863153" python
+install_package "pip-1.2.1" "http://pypi.python.org/packages/source/p/pip/pip-1.2.1.tar.gz#db8a6d8a4564d3dc7f337ebed67b1a85" python

plugins/python-build/share/python-build/jython-2.5.1

@@ -1,4 +1,4 @@
 require_java
 install_jar "Jython-2.5.1" "https://downloads.sourceforge.net/project/jython/jython/2.5.1/jython_installer-2.5.1.jar#2ee978eff4306b23753b3fe9d7af5b37" jython
 install_package "distribute-0.6.32" "http://pypi.python.org/packages/source/d/distribute/distribute-0.6.32.tar.gz#acb7a2da81e3612bfb1608abe4f0e568" python
-install_package "pip-1.3.1" "http://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gz#cbb27a191cebc58997c4da8513863153" python
+install_package "pip-1.2.1" "http://pypi.python.org/packages/source/p/pip/pip-1.2.1.tar.gz#db8a6d8a4564d3dc7f337ebed67b1a85" python

plugins/python-build/share/python-build/jython-2.5.2

@@ -1,4 +1,4 @@
 require_java
 install_jar "Jython-2.5.2" "https://downloads.sourceforge.net/project/jython/jython/2.5.2/jython_installer-2.5.2.jar#7c7d9abd8985df480edeacd27ed9dcd5" jython
 install_package "distribute-0.6.36" "http://pypi.python.org/packages/source/d/distribute/distribute-0.6.36.tar.gz#a923385de72dcdca68cd4ac2b9dc1148" python
-install_package "pip-1.3.1" "http://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gz#cbb27a191cebc58997c4da8513863153" python
+install_package "pip-1.2.1" "http://pypi.python.org/packages/source/p/pip/pip-1.2.1.tar.gz#db8a6d8a4564d3dc7f337ebed67b1a85" python

plugins/python-build/share/python-build/jython-2.5.3

@@ -1,4 +1,4 @@
 require_java
 install_jar "Jython-2.5.3" "http://search.maven.org/remotecontent?filepath=org/python/jython-installer/2.5.3/jython-installer-2.5.3.jar#41633b4557483d6d4237ee79ffcebe7b" jython
 install_package "distribute-0.6.36" "http://pypi.python.org/packages/source/d/distribute/distribute-0.6.36.tar.gz#a923385de72dcdca68cd4ac2b9dc1148" python
-install_package "pip-1.3.1" "http://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gz#cbb27a191cebc58997c4da8513863153" python
+install_package "pip-1.2.1" "http://pypi.python.org/packages/source/p/pip/pip-1.2.1.tar.gz#db8a6d8a4564d3dc7f337ebed67b1a85" python