Add plumbing.graph/compile, plumbing.graph/profiled

*   Adds a single function to 'default' compile a graph for both CLJ & CLJS
*   Refer to plumbing.graph/compile in docs
*   Update plumbing.graph/profiled to support CLJS
Add CLJS section to README
These tests tests can run in CLJS
Merge branch 'master' into v0.3.0

Conflicts:
	README.md
Put dep version back to 0.2.2

Temporary change until we push a 0.3.0 non-snapshot
Merge pull request #32 from Prismatic/v0.3.0

v0.3.0 improvements