Code clean up for mllib
Since getLong() and getInt() have side effect, get back parentheses, and remove an empty line
Indent two spaces
Merge remote-tracking branch 'upstream/master' into code-style
Added parentheses for that getDouble() also has side effect
Merge pull request #414 from soulmachine/code-style

Code clean up for mllib

* Removed unnecessary parentheses
* Removed unused imports
* Simplified `filter...size()` to `count ...`
* Removed obsoleted parameters' comments