JetBrains license added.
Autoimport tests created.
.recommenders folder added to .gitignore.
Autoimport duplication fixed.

 #KT-5360 Fixed
Most of methods are now static. New method for creating source files with specified packages.
Performing multifile tests, multifile test added to testData.
Multifile tests without parameters.
Merge pull request #53 from adkozlov/autoimport-fix

Autoimport fix
Ctrl+click navigation added.

 #KT-5366 Fixed
Minor: OpenEditor string is now a constant string in OpenDeclarationAction class.
Issues from comments fixed.
Methods for autotesting added to KotlinEditorTestCase.

All TestCase classes are now abstract. Methods for autotesting are not defined.
AllTests class added for completion tests.

Minor: code conventions
Minor: Java code conventions.
TestData for navigation added.
SourceFileData splitted and moved to KotlinEditorTestCase.
Tests for navigation performed.