added licence
[AESH-255] The project should to have gradle wrapper
[AESH-256] Add eclipse plugin in gradle.build
Merge pull request #83 from danielsoro/AESH-255

[AESH-255] The project should to have gradle wrapper
Merge pull request #84 from danielsoro/AESH-256

[AESH-256] Add eclipse plugin in gradle.build
changed optionvalidatorprovider, no need for it to be so "complex"
[AESH-257]
added OptionActivatorProvider, no hook for it yet