Merge pull request #200 from sunnycows/dev

CDATA support in XML coder
ROADWebService.md updated
Documentation updated
Tests for ROADCore updated
#206. Updating OData entity generator for ROAD. Adding return type for service methods in order to have possibility to cancel requests
Documentation updated
Merge pull request #208 from yuru-taustahuzau/dev

#206. Updating OData entity generator for ROAD.
Merge branch 'dev' of https://github.com/epam/road-ios-framework into dev
ROADCore tests updated
Merge pull request #209 from valery-demin/dev

Documentation and tests for ROADCore updated
Refactored XML attributes for more customized parsing.