Adding `Modernizr.prefixedCSS()` API

Squashed commit of the following:

commit 508b8934dc86d9fa22f563081f6dae2b9b0dcca0
Author: Stu Cox <stuart.cox@gmail.com>
Date:   Sun Mar 2 01:09:31 2014 +0000

    Updated comments in `prefixedCSS` to explain that it accepts either camelCase or kebab-case

commit 9ba6dfa96be800b1e668eac3978fb0c2494976d0
Author: Stu Cox <stuart.cox@gmail.com>
Date:   Sun Mar 2 01:01:56 2014 +0000

    Removing duplicated/unused code and re-adding `cssToDOM()` (got lost in the rebase somewhere)

commit 0062bd8ade4f4ef08359040f0e4e01424c004f5b
Author: Stu Cox <stuart.cox@gmail.com>
Date:   Sun Mar 2 00:39:29 2014 +0000

    Added tests for both camelCase and kebab-case inputs to Modernizr.prefixed and Modernizr.prefixedCSS

commit 87e7271a954095c17c10c9029832f443b1f60285
Author: Stu Cox <stuart.cox@gmail.com>
Date:   Sat Mar 1 22:10:55 2014 +0000

    `Moderizr.prefixed()` and `Modernizr.prefixedCSS()` now accept properties in camelCase OR kebab-case

commit c1ccbc91c0e7837166d1677ab49c2ab2bffbef62
Author: Stu Cox <stuart.cox@gmail.com>
Date:   Sat Mar 1 21:40:35 2014 +0000

    Changed `domToHyphenated` to `domToCSS` throughout the repo

commit 560a929ce9efc954fafd20eebbf46412c62221ed
Author: Stu Cox <stuart.cox@gmail.com>
Date:   Sun Dec 1 21:26:36 2013 +0000

    Added tests for prefixedCSS()

commit dc0d27170afef838218562286c3b350ae39469b1
Author: Stu Cox <stuart.cox@gmail.com>
Date:   Sun Dec 1 20:44:22 2013 +0000

    Added comment to prefixed() re. prefixedCSS()

commit 6e34fc143fea73200167c71588f89316b66475b4
Author: Stu Cox <stuart.cox@gmail.com>
Date:   Sun Dec 1 20:42:37 2013 +0000

    Changed name of prefixedHyphenated to prefixedCSS

commit fb9f494f51e769bccf5455956c4239a7774e60be
Author: Stu Cox <stuart.cox@gmail.com>
Date:   Tue Jul 16 18:28:59 2013 +0100

    Handled case of `prefixed()` returning false and added to `config-all.json`

commit 7748702dfe4a5158ab970a84cbc6ae4a9e7459fd
Author: Stu Cox <stuart.cox@gmail.com>
Date:   Tue Jul 16 18:11:49 2013 +0100

    Added domToHyphenated dependency

commit 74b5b9a5e476c41ddd1dc9fbb1363c3b3783b6a7
Author: Stu Cox <stuart.cox@gmail.com>
Date:   Tue Jul 16 17:57:35 2013 +0100

    Added prefixedHyphenated function
Merge pull request #848 from stucox/prefixedCSS

Method to provide hyphenated versions of prefixed CSS properties