Using the bin path at root of pwd

The compile script is run with the root of the git repo of the project
being pushed as the working directory.

$BIN_DIR is pointing to the bin directory of the buildpack which is not
where you would want to put the pre and post compile hooks.

Changing back to the old convention of looking for the hooks from the
bin directory at the root of the project.
Merge pull request #86 from manojlds/master

Fixing the compile hook scripts paths
Merge remote-tracking branch 'origin/master'
Remove shared db and add heroku-postgresql dev db
Merge pull request #89 from gregburek/use-pg-dev-db

Remove shared db from release and add heroku-postgresql dev db
moves cache storage until after the post_compile hook.
Merge pull request #90 from buildingenergy/master

Store changes made in post_compile in the cache.
Update Readme.md
added django 1.5 skeleton for testing
added requirements.txt with django v1.5
added Django v1.5 tests
Merge pull request #93 from bacongobbler/master

Add Django v1.5 testing support with Heroku