Don't lose bits when combining literals.

Don't tell Literal() how wide the result of a literal operation is (at
least for +/-), let it figure it out.
Fix the width inference code in Literal.apply() to deal with negative
numbers correctly - we get values that appear to be too small (and
disagree with the Java debugger's ideal of the object's value!).
Use floatWidth and doubleWidth instead of 32 and 64 respectively.
By the time the Tester runs, all widths should have been inferred. Use
needWidth() instead of getWidth for signed_fix().
Disable superfluous scalastyle warnings in StdlibTest.scala.
Add testLitAddSub() for the "fixed" literal handling.
Don't override an explicitly set width for Literals.

Provide Literal.bitLength method to deal with bitLength anomalies.
Merge branch 'master' into literalwidths
fix naming problems when adding modules in custom transforms
Bundle.calcElements calculates too many #295.

Ignore methods with '$' in their name, as they are compiler generated,
and their semantics are unspecified.
Merge pull request #293 from ucb-bar/literalwidths

Literalwidths
Merge pull request #296 from ucb-bar/calcElementfix295

Bundle.calcElements calculates too many #295.
Add tests for pr/291 issue #290 fix - Critical : Register with custom clock for a bundle generate wrong verilog.
Merge branch 'master' of https://github.com/ucb-bar/chisel