Delete optparse

[tleonhardt]

Deleted optparse code which had been previously deprecated in 0.8.0 release

Also:

• Bumped version to 0.9.0

This ended up being a larger change than I thought it would be at first mostly due to the fact that I forgot we had a bunch of unit tests that we had never ported to use the new decorators.

This closes #340

[tleonhardt]

@kotfu I couldn't quickly figure out what was going wrong with these two unit tests here so I commented them out. If you can figure it out without too much effort, then please go ahead and fix them.

[codecov]

Codecov Report

Merging #344 into master will decrease coverage by 0.34%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #344      +/-   ##
==========================================
- Coverage    89.6%   89.26%   -0.35%     
==========================================
  Files           1        1              
  Lines        1982     1909      -73     
==========================================
- Hits         1776     1704      -72     
+ Misses        206      205       -1

Impacted Files	Coverage Δ
cmd2.py	89.26% <100%> (-0.35%)	⬇️

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[tleonhardt]

This will end up being the first PR or so to go into the 0.9.0 cycle, but we can't merge it in until after we put out the 0.8.5 release as well as create a python2 branch and tag. Then we will need to merge stuff in here and update.

[tleonhardt]

The 0.8.5 changes have been merged in from master and the version in this PR has been bumped to 0.9.0.