Improve Editorconfig for formatting

[joachimprinzbach]

From @joachimprinzbach on June 19, 2016 16:33

• Config should enable automatic formatting to match TsLint rules
• Config should at least work in IntelliJ 2016

Copied from original issue: joachimprinzbach/ng2-camp#10

[joachimprinzbach]

https://github.com/angular/clang-format