[feature] Use external data for mocks

Added google.load to visualization mock
Can now load custom mock data
Merge pull request #37 from alex-deaconu/master

[feature] Use external data for mocks
Ability to specify number of concurrent chrome instances
Merge pull request #38 from settinghead/master

Ability to specify number of concurrent chrome instances
[feature] Extended gadget-mocks functionality

Moved file to mocks folder
Returning rsH and rsW params

Saving callbacks sent to rpc.register
Respond to ready event with play command
Respond to rsparam_get and append external additionalParams if present
Merge pull request #39 from alex-deaconu/master

[feature] Extended gadget-mocks functionality