Adding self-host testing infrastructure and scripts (including tach
plugin)
Incorporating cgrand/macrovich plugin to separate macro definitions from usage in specter.cljc
Changing tests to use :require with :refer-macros to bring in cljs.test macros in cljs mode
Rewriting extend-protocolpath to use extend-protocol, which is available in cljs (extend is not)
Fixing ic-prepare-path implementation to use VarUse even in hosted mode (hardcoding the condition to false)
Various changes in test files to get them working in all three modes
In test, using correct symbol for inc depending on the environment
