Removed "name" field from remote plugin form

Removed "name" field from remote plugin form.
Added css for tables with restricted width columns.
Added description column to plugin list.
Enhanced test suite to improve coverage.
Fixing NPE in tests addLocalPlugin:248

Fix for the NPE mentioned in https://github.com/crawljax/crawljax/pull/346#issuecomment-25814980
Merge pull request #364 from keheliya/patch-1

Fixing NPE in tests addLocalPlugin:248