Cleaned up CONTRIBUTING.md.

Removed unneeded newlines and corrected the rendering of the numbering of the
Pull Request section.
Added formatting rules for Eclipse.

There were two conflicting formatting issues I could find.

1. Whitespace on blank lines.
2. Whitespace using casts.

For both of these there’s been two conventions.
I’ve used the one that causes the least changes in the source.
ie: Strip whitespace and add a space between the cast and object.
Applied formatting rules to Bolts and BoltsTest.
Merge pull request #4 from bradley-curran/feature/add-formatter-rules

Added formatting rules for Eclipse.
Merge pull request #3 from bradley-curran/feature/cleanup-contributing

Cleaned up CONTRIBUTING.md.
Add Gradle build files.

Updated .gitignore with Android and IntelliJ recommended exclusions.

Updated Gradle to 1.10
Fix javadoc of Task.cancelled() method
Merge pull request #6 from mkochenough/fix-javadoc

Fix javadoc of Task.cancelled() method