Update README.md
Update README.md
Reverted mode to not executable on resttest.py
Added json validator and fixed bug with response body no getting cleared
Added how to run the example test with json validation
Fixed operator application order and added new 'contains' operator
Merge remote-tracking branch 'svanoort/master'

Conflicts:
	README.md
Updated headings in readme
Added expanding env variables in test configurations (yaml)
Added custom operator 'empty'.  Will open issue for fact that have to still supply expected
Added logging
Attempt at fixing json dump of custom objects
Exit code now is equal to number of failures.
Test request body loaded from external file now has expandvars applied
Added some debug logging in validator processing
Merge remote-tracking branch 'svanoort/master'

Conflicts:
	resttest.py
Fixed body reader to handle when data is None
Better handling of 'empty' operator, won't drop through to other tests in strange ways anymore
Added 'exists' operator to simply check for element existance, similar to 'empty' checking it doesn't exist
Fix #5: no longer have count element on validator, just set operator of count and expected to the count there should be