Upgraded dependencies, added missing Typescript configuration file and fixed lint errors, upgraded the build configuration file to use ES6 and added prettier configuration file.

• added stryker mutator (core) dependency 4931e35
• commented test that is hard to run (dealing with milliseconds) 3fac5d3
• built files aec55d0
• removed unit tests that were not useful 5c8302e
• fixed typescript errors f10455f
• using more modern tools to build the files 9a01978
• added prettier configuration 69afe28
• added typescript configuration file ac6de4a
• added release command in the package.json e5fefed
• using ES6 in gulpfile a763ce4
• added package version checking step before building and developing c26a26a
• updated dependencies 89b8391
• added dependencies badges to the documentation 9e86bf3
• updated dependencies 52ede47
• fixed a bug when too much files where provided on installing the package 5e808ac
• excluded stryker generated files 4d24854
• improved contributing section d7f71ca
• added contributing section 2abcb84
• fixed indentation e8f7d9f
• added npm badges 5c0aad7

v0.1.1...v0.1.2