Add a buffered input stream when reading persistent unit cache
Make -Dgwt.persistentunitcachedir override the default cache dir if set.
Fail fast if we can't reate a file in the cache directory
Better test to see if directory exists before trying to start the cache.
Added a few more unit tests

Review at http://gwt-code-reviews.appspot.com/1386807

Review by: scottb@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9904 8db76d5a-ed1c-0410-87a9-c151d255dfc7
3 files changed