Generate bundled, browser-friendly version of libsbp (#476)

* Generate bundled, browser-friendly version of libsbp in `make javascript`, and make sure it gets published to npm.

* Simple fix to Buffer not being available in eval'd context

* statically provide all dependencies

Author: JoshuaGross

Makefile

@@ -100,6 +100,7 @@ deps-python: verify-prereq-python
 deps-javascript: verify-prereq-javascript
 	$(call announce-begin,"Installing Javascript dependencies")
 	cd $(SWIFTNAV_ROOT); npm install
+	cd $(SWIFTNAV_ROOT); npm run webpack
 	$(call announce-end,"Finished installing Javascript dependencies")
 
 deps-java: verify-prereq-java