Handled svg tex not reachable error.
Merge branch 'master' into svgtex_connection_error
Merge branch 'feature/png_as_file' into svgtex_connection_error
Added encoding comment on top.
Added encoding to saving png images. Removed encoding from file.
Changed the exception raised for server not reachable.
Merge pull request #4 from quipper/svgtex_connection_error

Svgtex connection error