* Include Safe Casting Library with complete and exhaustive test-suite.

* linting test file.

* Typo in SafeCast import statement

* Update test/utils/SafeCast.test.js

* Rename `castUXX` to `toUintXX` from suggestion

* Tackling the quick and easy suggestions regarding error string improvements etc.

* typo and changelog update.

* Improve SafeCast tests

* Update test/utils/SafeCast.test.js

* Update test/utils/SafeCast.test.js

* incorrect import

* add SafeCast to docs site

* Update CHANGELOG.md

* Update SafeCast.sol