Added/Updated MIME Types

[RehanSaeed]

Added the following MIME types which I have found to be missing:

• .json - application/json (This one is pretty unbelievable)
• .ttc - application/x-font-ttf
• .webp - image/webp
• .appcache - text/cache-manifest
• .manifest - text/cache-manifest

Also the following MIME types need updating:

• .ttf should be application/x-font-ttf and not application/octet-stream

I've created a new Pull Request dev...RehanSaeed:patch-1

[muratg]

@RehanSaeed Could you create a GH pull request (based on your check-in) so that we can put code review comments? Thanks.

[RehanSaeed]

@muratg Here you go #64