Better handling of quotes for subsettings

Prior to this commit, the `ini_subsetting` type assumed that
all of the settings strings were quoted, and always wrote
out the modified value with double-quotes around it.

This commit adds tests for the case where the original setting
is not quoted, and intelligently writes the modified setting
with the same quote character (or lack thereof) that the
original setting used.
Update Modulefile and Changelog for 0.10.2 release
Merge pull request #45 from cprice-puppet/bug/master/better-handling-of-quotes-for-subsettings

Bug/master/better handling of quotes for subsettings