v0.7 / master fixes

Merge pull request #32 from JuliaString/spj/signif

Work around broken signif call on master

Updates for v0.6 compatibility

Merge pull request #4 from JuliaString/spj/fix06

Fix deprecation warning on v0.6, clean up trailing spaces

First release for v0.5 and v0.6-dev

This is based on the original Formatting.jl, however it has been modified greatly, first by incorporating PR #10 (by Tom Breloff), and then parts of it rewritten so that it would work with my StringLiterals package,
clean up the naming of certain functions, and fixed to work under v0.6.