Add .gitignore file for the plfs_offset test.
Change numbering scheme for types of tests.

The test types have been redone. Each type now more closely reflects the
needed resources for a particular test.
Merge pull request #31 from thewacokid/2.5dev

2.5dev - updated for the newest code in master
Updated test suite to handle new AD_PLFS_ flags and get rid of RS_PLFS_*
environment variables.