Added abs method to report absolute value.
Improved protection for member functions.
Removed redundant val declarations from constructor arguments.
Minor cosmetic changes.
Refactored buggy measurement output.
Added utility class to assist with certain calculations.
Bumped SBT to current release (0.13.6).
Miscellaneous build script modifications.
Bumped SBT to latest v1.0 "technology preview" release (v0.3.7).
Bumped Scalastyle to latest release (v0.6.0).

Note that this release no longer requires ScalastylePlugin.Settings be imported
for each subproject. (Indeed, there is no longer a .Settings member of
ScalastylePlugin).
Bumped Scala compiler to latest release (v2.11.4).