Merge pull request #13 from apojha/master

[#10] adding builder to ActivityClient and making constructor private
Merge pull request #14 from apojha/issue10

[#10] creating more builders for objects
[#9] Renaming admin port to port and giving priming client default port of 8043
[#16] Extending the activity client to retrieve executed prepared statements.
[#16] method for deleing existing prepared statement executions
[#11] variable types allowed in prepared statements plus a couple minor refactorings
Merge branch 'master' of github.com:chbatey/scassandra-java-client