QueryBuffer double block comment fix

Added functionality to QueryBuffer to work with double block comments
ex. "SELECT /* 'hello\" /*--*/ there $$ */"

Single test has been added to QueryBufferTest with given example
Cleaned up QueryBuffer double block quote

Fixed following suggestions:
Moving blockQuoteCount from the Quote enum to the QueryBuffer class
would be more consistent
Pulling the block quote definition out of the array, just like
DASH_QUOTE, would remove the magic QUOTES[4]
The new isBlockQuote member and methods can be eliminated in favor of
direct comparison with above (i.e. BLOCK_QUOTE)
Fixed requested changes for Double

Made changes as described
merge JerettS: QueryBuffer double block comment fix

Merge pull request #59 from JerettS/sql-layer-client-tools/Fixing_Buffer
https://github.com/FoundationDB/sql-layer-client-tools/pull/59