Remove simplecov

simplecov 0.9 dropped ruby 1.8 support, and stdlib is one of the oddball
modules that uses it. So we could probably just remove it and be okay.
Merge pull request #308 from hunner/remove_cov

Remove simplecov
Update spec_helper for more consistency
Merge pull request #313 from mhaskel/spec_updates

Update spec_helper for more consistency
Updated docs of validate_string to reflect bug

See: https://tickets.puppetlabs.com/browse/MODULES-457
Note that also future parser does not work
Merge pull request #320 from JimPanic/patch-2

Update docs of validate_string to reflect bug
Fix strict_variables = true
Adds a convert_base function, which can convert numbers between bases
Adds some documentation for the convert_base function
Add protections again non-base-10 integers being submitted as strings
Merge branch 'add_convert_base'