Merge tag '2.6.1' into develop

2.6.1
Add Signature
Add test to ensure custom imports work as expected
Transform indent setting on SortImports init to match specifications
Add support for integer based indents (4 == four spaces
Implement support for integer based indents
Document additional functionality
Merge pull request #86 from timothycrosley/feature/fix-issue-85

Feature/fix issue 85
Bump version to 2.6.2
Merge branch 'release/2.6.2'