Added tests for snippetText indexer.
Include description in snippetText.
Added test to ensure that snippetText does not contain searchwords.
If there's a SearchableText indexer, use it for snippetText generation.
Load overrides in tests.
Exclude searchwords in schema from SearchableText instead of removing it afterwards.
Merge pull request #9 from 4teamwork/snippettext-fixes

Snippettext fixes