Small test code format correction
Added tests for RS synonyms handling
Avoid reusing argument name as local variable
Removed "from import *" in pelix.framework

All framework constants must now be accessed from pelix.constants.
Added RS test for HTTP Transport: undefined method
Adding code coverage in subprocesses

Coverage now combines both client and server-side code from remote services tests
Based on the trick found at:
http://blog.schettino72.net/posts/python-code-coverage-multiprocessing.html
Ignore parallel coverage files
Added the "pelix.remote.export.reject" property

- Content: a single or a list of specifications to never export
- When a service uses '*' to export all of its specifications, this property
  allows to reject the export of some of them.

This is usefull when using an agent that automatically adds the export property to
instantiated components: some non-exportable specifications (like shell commands)
can be marked as "rejecting export".