Updated hunspell documentation with new 0.90.3 features
Correcting camelcase to snake case
Added documentation about pattern replace char filter
Added docs for pattern_capture token filter

Closes #475
Updated suggest documentation to incorporate completion suggestions

In order to have useful documentation, the suggest documentation is now
split into three pieces, one for each suggester.
s/maxMergeDocs/max_merge_docs
Updating ec2 docs to check for current version
added missing offsets index_options