Add requierd hive config param and cube query config params in grill server, session and drivers
Merge branch 'develop' into doc-update
Update doc
Update cube queries not to have literal in timerage function
Merge pull request #124 from InMobi/doc-update

Add required hive config and query config params in *-default.xml files
adding cluster user for query execution

Fixes:
	1. User related configs will be resolved when session is opened. Cluster user, queue etc. belong to this category
	2. from cli, current logged in user will be passed as cluster user
	3. Domain can be specified on grill level and will be passed to authentication providers as needed
	4. Config will be resolved by config loaders. This can be chosen from the ones provided, or can be custom. Providing three such implementations. Each has its own config.
	5. Test cases for each loader. And test cases for verifying cluster user and loggedin user are set in session.
reviewed comments and made changes. Nothing major.
Merge pull request #125 from prongs/cluster_user_clean

adding cluster user for query execution
Fixing small issues
	1. Correcting default values for database config loader
	2. Removed Exception Constructor because java 6 doesn't have that constructor for the super class (RuntimeException)
	3. Regenerated apt file
Merge pull request #126 from prongs/cluster_user_clean

Fixing small issues
Data-598 Process time for Finished Purged Query
Add service provider api to get instances of various services
Merge pull request #128 from jdhok/develop2

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

Updated service provider factory config documentation
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
ldap backed database user config loader