Fix Amazon SES issues

[vitorio]

Using mailer 4.0.1 with Python 2.7 and boto 2.38, the amazon transport doesn't work out of the box.

• The transport file is called ses.py but the transport is amazon.
• boto doesn't know what to do with the host argument in the README, and throws this error: TypeError: __init__() got an unexpected keyword argument 'host'
• boto doesn't know what to do with marrow mailer's use argument, and throws this error: TypeError: __init__() got an unexpected keyword argument 'use'

This pull request resolves these issues by:

• README.textile now specifies that the transport is called amazon, addressing Update docs that "ses" transport is actually "amazon".  #57 (although not providing an ses alias).
• The host line is removed from README.textile.
• The use argument is popped before any other parameters are passed into config.

With these changes I can successfully send mail.

[codecov-io]

Current coverage is 85.28%

Merging #61 into develop will not affect coverage as of 1cf96dc

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  Files            10      10       
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  Hit             655     655       
  Partial           0       0       
  Missed          113     113       

Review entire Coverage Diff as of 1cf96dc

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[vitorio]

Thanks!

[amcgregor]

Same comment as the other PR. ;)