Merge pull request #4 from OpenScienceFramework/issue_4

Correctly handle bold/italics/underline tags
refs #5: added a test showing what happens if the text is missing or if the rId is not in the rels dict
Merge pull request #5 from OpenScienceFramework/issue_5

Get hyperlinks working
Merge branch 'master' into issue_6

Conflicts:
	pydocx/tests/test_xml.py