Summary:
Move the base Jasmine spec runner into isomorphic-core to prevent
code duplication. Jasmine will look for the config file relative to
the directory it's being run in though, so we need to symlink the
config file into each package that will need it.
Test Plan: Run tests once the suites are integrated
Reviewers: evan, spang, juan
Reviewed By: spang, juan
Differential Revision: https://phab.nylas.com/D4056
