Merge pull request #10 from mbroadst/unify-select-query

unify selectQuery between abstract and mssql dialects
improve index support for mssql dialect

  - bring addIndexQuery in line with abstract dialect
  - use an improved method for showing indices with sp_helpindex
  - actually use handleShowIndexQuery (bringing us closer to the
    abstract dialect for formatResults)
  - temporarily disable tests for a FULLTEXT index