junit support for gradle

Added junit support for gradle
gradle build will run minimal test cases and runs in 4 minutes
gradle jar will not run any test case
gradle junit will run all junit and takes about 30 minutes
Fixed NetworkClassLoader bug when running in Windows OS
Added url explaining the problem in deep
Merge pull request #186 from ctasada/NetworkClassLoader

Fixed NetworkClassLoader bug when running in Windows OS
Merge pull request #185 from arunthirupathi/gradleJunit

junit support for gradle, Will Merge in this commit and will apply the patch on the top from Szczepan.
Added the ability to query a single store using AdminClient / admin tool
Addressing review comments for fetch_single_store