Issues/116 - fix EC2 instance types

[jantman]

• add t2.nano EC2 instance type
• fix typo - "m4.8xlarge" should have been "m4.10xlarge"
• update default limits for m4.(4|10)xlarge

[codecov-io]

Current coverage is 100.00%

Merging #133 into develop will not affect coverage as of f11981b

@@            develop    #133   diff @@
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  Files            17      17       
  Stmts          1373    1373       
  Branches        224     220     -4
  Methods           0       0       
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  Hit            1373    1373       
  Partial           0       0       
  Missed            0       0       

Review entire Coverage Diff as of f11981b

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