Merge pull request #40 from viig99/master

Adding Cookie Support.
Massive commit on iteration as one
Fixing the runner.
Added IterationRunner as a class, and some docs
Fixed failing tests
Changed path_regex and added case for undefined response
Added some documentation
Added an error handler class, some docs and UT for var processor
Refactored iteration runner
DRYed the response handlers
Fixed PR comments
Fixed linting errors
Merge pull request #44 from prakhar1989/master

Added iterationrunner as a class and fixed some documentation.

Please add the PR's as soon you do anything else.
Adding feature for ResponseExporter, need to add where to call the exporter function from.
Rectifying problems with merge.