Issue#41 - Get input/output files from extension

[tenshi13]

• attempt for issue Get input/output files from extension #41
• added logic to do file name extension fallback, when there is no specified renderer
• if no suitable extension is available, it goes back to default to pdf as the renderer
• if renderrer flag is specified (e.g. --pdf), the specified renderer will have precedence

e.g. : as per example/commends in #102
yamp "README.md" "-o" "readme.html"
readme.html created

yamp "README.md" "-o" "readme.pdf"
readme.pdf created

yamp "README.md" "-o" "readme.html" "--pdf"
readme.html.pdf created

[angrykoala]

jshint failed in travis, please fix the following problems before merge:

• bin/yamp_cli.js: line 78, col 25, ['outputFileExtension'] is better written in dot notation.
• bin/yamp_cli.js: line 79, col 56, ['outputFileExtension'] is better written in dot notation.
• bin/yamp_cli.js: line 80, col 47, ['outputFileExtension'] is better written in dot notation.
• bin/yamp_cli.js: line 110, col 38, Expected '===' and instead saw '=='.

[tenshi13]

Hi @angrykoala I've just did a quick update, hopefully its ok now.
Sorry am still very new with nodejs

[codecov-io]

Current coverage is 94.64% (diff: 100%)

Merging #111 into dev will increase coverage by 0.22%

@@                dev       #111   diff @@
==========================================
  Files            12         12          
  Lines           215        224     +9   
  Methods          39         39          
  Messages          0          0          
  Branches         35         37     +2   
==========================================
+ Hits            203        212     +9   
  Misses           12         12          
  Partials          0          0          

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[angrykoala]

@tenshi13 No problem, good job

[tenshi13]

wooo awesome! thx for the merge : D