Add support of inserting a SWIFTLINT_CURRENT_FILENAME placeholder in the required_pattern.
The placeholder will be replaced by the lastPathComponent of the file's path.
The MIT license doesn't require that all files be prepended with this
licensing or copyright information. Realm confirmed that they're ok with this
change. This will enable some companies to contribute to SwiftLint and the
date & authorship information will remain accessible via git source control.
This adds 6 tests that were accidentally not being run on Linux:
* LineLengthConfigurationTests.testLineLengthConfigurationInitialiserSetsIgnoresComments
* LineLengthConfigurationTests.testLineLengthConfigurationInitialiserSetsIgnoresFunctionDeclarations
* LineLengthConfigurationTests.testLineLengthConfigurationThrowsOnBadConfigValues
* LineLengthRuleTests.testLineLengthWithIgnoreCommentsEnabled
* LineLengthRuleTests.testLineLengthWithIgnoreFunctionDeclarationsEnabled
* RegionTests.testSeveralRegionsFromSeveralCommands