Fix 'make build_plt'

The dialyzer --add_to_plt call was not specifying the proper
rebar plt to add diameter to.
Fix minor typo in CONTRIBUTING.md
Merge pull request #355 from tuncer/fix-make_build_plt

Fix 'make build_plt'
Merge pull request #356 from tuncer/contributing-typo

Fix minor typo in CONTRIBUTING.md
Escape more characters in path (fix #367)
Merge pull request #368 from eproxus/handle-more-characters-in-paths

Escape more characters in path (fix #367)
Fix cover print truncation when coverage is 100%

When the option {cover_print_enabled, true} is set and that the code
coverage is 100%, the '%' will end up being truncated.

This patch makes it so that the truncation happens at 4 a characters
width so that instead of the following printouts:

    some_mod  : 99%
    some_other: 100

We instead show:

    some_mod  :  99%
    some_other: 100%

This solves issue #331 as reported by @lispking and @NineFX.
Merge pull request #371 from ferd/cover-print-percent

Fix cover print truncation when coverage is 100%
Add details on Dialyzer with "make check"

If Dialyzer hasn't been used on an account before, there won't be a PLT
file and "make check" will fail. Added info on that fact.