HighLightingParameters.

Added support for hl.q
Added test to support new parameter.
Query is now a SolrQuery. Updated documentation. Updated test.
Highlight Query exposed as ISolrQuery.
Fix test
Specifing date time kind if unspecified
1) Expanded Grouping Query to include multiple queries (For example: http://localhost:8983/solr/select?wt=json&indent=true&fl=name,price&q=memory&group=true&group.query=price:[0+TO+99.99]&group.query=price:[100+TO+*]&group.limit=3)

2) Added a Test on Grouping Query
Corrected a copy/paste mistake on class being renamed.
BUGFIX: Added check for null on group.field and group.query.
Update Sample-application.md
Merge branch 'master' of git@github.com:haricharan123/SolrNet.git
Added support for cursormark
Another test for stats parsing
Disallow construction of CursorMark.
It's a value managed by Solr only, not by the client.
Added cursormark documentation
Fix some typos. Better docs
Enforce "cursor or start" constraint in the type system.
Merge CursorMark into StartOrCursor.Cursor
Update CursorMark.md
Update Querying.md
Merge branch 'cursormark'

Conflicts:
	Tests.fsx