Update various classes and tests for compatibility with elasticsearch v1.0.0.RC1
Fix Elastica\Test\Node\InfoTest::testGet()
Change is_double to \!is_null Elastica\Test\Node\InfoTest::testGet()
Remove print_rs from tests. Change Elastica\Test\Transport\TrhiftTest::checkPlugin() to _checkPlugin()
Merge pull request #546 from jlinn/1.0.0.RC1

Update for compatibillity with ES 1.0.0.RC1