Merge pull request #35 from mjedynak/master

added gradle wrapper
Make gradle wrapper executable by default.
Small change of presentation in lookup item for function.
Refactoring - 2nd step. Adding test cases.
Closes #4 - Function completion from imported files missing.
Additional fixes of function imports.
Improve test case.
Improving gradle build.
Add instruction on running gradle build.
Improving gradle build.
Cloudbees status.
Refactoring - 3rd step.
Small updates to readme files.
Updated copyright headers with email address.
Updated .gitignore with gradle specific directories.
Updated README and plugin info
Remove standard idea files. Generate project from gradle.
Refactoring - 4th step.
Refactoring - 5th step.
Changing icon.