Allow images other than JPEG, PNG or GIF (.ICO, as example)

[vmartinelli]

Allow images with other formats than JPEG, PNG or GIF to be converted from downloaded image data (.ICO, as example)

[codecov-io]

Current coverage is 79.34%

Merging #278 into master will not affect coverage as of aa06e19

@@            master    #278   diff @@
======================================
  Files           12      12       
  Stmts         1375    1375       
  Branches         0       0       
  Methods          0       0       
======================================
  Hit           1091    1091       
  Partial          0       0       
  Missed         284     284       

Review entire Coverage Diff as of aa06e19

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[onevcat]

Cool, thanks for it.