Adding support for struct tags
updated source to match license file
Merge pull request #8 from smcquay/master

updated source to match license file
Merge pull request #7 from modcloth/struct-tags

Adding support for struct tags
added support for envconfig with no prefix if alt tag is set
Merge pull request #10 from bketelsen/master

added support for envconfig with no prefix if alt tag is set
Allow more complex fieldname to use underscore case which is cleaner
Allow mapping without prefix
additional testing