use internal pouchdb when perfdb not provided
support for testing against more clients

new param on config/local.js
  TestEndpoint : "ios"  // ios, android, pouchdb, couchdb

specifies what platform tests will be ran against

brings back http launcher to start ios or pouchdb instances.
couchdb and android can be easily test by modifying local.js
but have to be manually started
Merge branch 'master' of https://github.com/couchbaselabs/cblite-tests