adding in support for kwarg partials
pulled some original dust documentation into the docstrings of ashes functions.
added COMPATIBILITY.md to track compatibility against LinkedIn fork
bringing the behavior and style of `Context`'s `get` and `get_path` into line with the LinkedIn form:
* `get_path` and `get` now proxy a univsersal `_get`
* the behavior now walks up a tree, so dirty hacks to access variables outside scope are not necessary.  ie : {#A.B} name in B={name} {#A} name in A: {name} {/A} {/A.B}
Merge pull request #15 from jvanasco/master

adding in support for common LinkedIn fork features