Remove jspm peer dependency

## Problem
Users wishing to try a beta version of jspm get some friction because of the peerDependency. wGulp expects a certain version and if it doesn't match there is a peerDep failure

## Solution
Remove jspm as a peerDependency. Assume user has it installed globally.

## Testing
- Ensure tests pass
- Ensure bundling examples work

@trentgrover-wf