Update README.md

Bug # 93: Clearer link to the main reference document with an overview of the main features of Mockito (organized by use case rather than by release date).
Update README.md
Update README.md

then -> given
Update README.md
Update README.md
Added Ben to the release notes

[ci skip]
buildSrc tidy-up. Removed dependency on Gradle.

Also pushed one final class from groovy->java so that the library can be extracted out of this code.
buildSrc tidy-up. Now it is all java code.

Tests are still spock of course!!!
Pushed release-notes script plugin into buildSrc

Needed joint compile java with groovy.
Improved fetching GitHub issues.

We're using a single rest call to acquire the issues.
Removed not-needed file.
Simplified GitHub ticket collection

Started using read-only auth token so that the code runs everywhere and does not require secret env variable. Added test for GitHub api query (not very nice, yet)
Added a TODO and removed jcabi from dependencies
Changed CallsRealMethods to delegate to default answer for abstract methods.

Fixes #122
Avoided some duplication
Fixed a dumb mistake (thx, travis ;p)
Increment version '1.10.13' -> '1.10.14' by Travis CI build 322 [ci skip]
"Update release notes by Travis CI build 322 [ci skip]"
Removed a fixed TODO.
Tidy up and refactoring