Add service provider api to get instances of various services
Return in case of SemanticException in analyze internal
Merge pull request #128 from jdhok/develop2

Add service provider api to get instances of various services
Review comment incorporated
Updated service provider factory config documentation
Merge pull request #130 from jdhok/develop2

Updated service provider factory config documentation
review comment incorporated
review comment incorporated
Merge pull request #129 from sushilmohanty/develop

throw all exceptions out in ColumnarSQLRewriter
Merge remote-tracking branch 'develop_remote/develop' into GRILL-598
Close result in JDBCDriver.explain
Merge pull request #131 from jdhok/develop2

Close result in JDBCDriver.explain
test case for finished purged query
Merge remote-tracking branch 'develop_remote/develop' into GRILL-598