make hadoop dependency as provided
Set hadoop-2 version to 2.4.0
Merge branch 'develop' of https://github.com/InMobi/grill into hadoop-2-update

Conflicts:
	grill-server/src/main/java/com/inmobi/grill/server/metastore/JAXBUtils.java
	pom.xml
Add hadoop-2 profiles in all poms
Use hadoop-2 version for compilation
Add guava jar in server classpath
Redirect errors while adding classpaths
Update common jars for hadoop-2
Merge branch 'develop' of https://github.com/InMobi/grill into hadoop-2-update

Conflicts:
	grill-server-api/pom.xml
Merge pull request #56 from InMobi/hadoop-2-update

Compile grill with hadoop-2