reorganise files into package
add files to run metajson as a script

i.e:
- ./metajson-runner.py
- python -m metajson
update readJSON with main method
move templates inside package
Fixes running readJSON_test
trim white space
modify definition of JSONScheme to metajson.JSONScheme
change location of test_data to test/data
fixing last templates issues and enable all tests
Update setup.py to install metajson
ignore build folder