Merge pull request #1 from TrystanLea/master

php timestore wrapper class and example
PHP example: Don't url_encode args before calculating HMAC
Fixed PHP do_request to support content types other than JSON
Testing support for float-sized data items
Merged float branch back in to master (define TSDB_FLOAT_TYPE to enable)
Added command line switch to persist admin key. Closes #36
Changed default data type to float