Migrated from ElementTree to lxml.  #176
Updated requirements for lxml.  #176
Confirmed to work with lxml 3.2.3, down from 3.3.  #176
Removed orphaned pretty print code for old element tree interface.  #176
Updated lxml requirements, checked on Raspbian.  #176
Merge branch 'issue176' of https://github.com/quintusdias/glymur into issue176

Conflicts:
	setup.py
Updated docs for lxml requirement.  #176
refactored nemo xml  #176
Fixing indentation issues with textwrap.  #176

XML had been flush left since introducing lxml, but the textwrap module
fixes that easily.
Merge branch 'issue176' of https://github.com/quintusdias/glymur into issue176

Conflicts:
	glymur/test/fixtures.py
Merge branch 'issue176' into devel