FEATURE (settings): add export/import of user settings

- add export/import of user settings

Closes #61
FIX (dotfiles in gist): fix links of dotfiles

- fix links of dotfiles not handled correctly by "dotToDash" custom filter
FIX (settings): fix export/import of user settings

- fix export/import of user settings to tread data more safely for future development
FIX (editor): fix font size settings issue

- fix font size settings issue when size not changing to value set in settings
FIX: FIX (single gist): Files over 1mb now load properly

- Makes an additional request to the raw url as per github API dictates.

Fixes #85

Author:       Maayan Glikser <maayan@glikm.com>