Add session id to Session cmds, when appropriate

[askedrelic]

Starting on fixing #64.

[tony]

Let's try to take the approach where we smooth out the *args (#64 (comment)). We can use += instead of .extends( to avoid an extra function call (#64 (comment)).

[askedrelic]

So I rebased my code to use += to add the session id, if it is not set. It's a little more complicated due to tmux requiring the -t arg be in a specific position, but the test suite should be passing!

[askedrelic]

Hmm looks like tests broke due to Py3. I'm still using Py2 as my main environment, I will take a look!

[codecov-io]

Codecov Report

Merging #65 into master will increase coverage by 0.09%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
+ Coverage   79.97%   80.07%   +0.09%     
==========================================
  Files           8        8              
  Lines         844      848       +4     
==========================================
+ Hits          675      679       +4     
  Misses        169      169

Impacted Files	Coverage Δ
libtmux/session.py	81.09% <100%> (+0.47%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d6df234...a9bf0a5. Read the comment docs.

[tony]

@askedrelic nice job!

[askedrelic]

Hooray, thanks for the merge @tony 🎊

[tony]

released in v0.7.4