Updating README

[PeterHamilton]

This change updates the PyKMIP README, adding additional information on the new software server in addition to other minor updates.

[coveralls]

Coverage remained the same at 85.769% when pulling 361e261 on feat/update-readme into d7b27b2 on master.

[codecov-io]

Current coverage is 85.76%

Merging #166 into master will not affect coverage as of 361e261

@@            master    #166   diff @@
======================================
  Files           62      62       
  Stmts         7589    7589       
  Branches         0       0       
  Methods          0       0       
======================================
  Hit           6509    6509       
  Partial          0       0       
  Missed        1080    1080       

Review entire Coverage Diff as of 361e261

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[joel-coffman]

👍