Relax dependencies to work with ghc-7.6.3

Relaxed dependencies for base and bytestring packages, for ghc-7.6 compatibility. bytestring-0.10.0.2 and base-4.6.0.1 are bundled with ghc-7.6.3. A `tested-with` field has also been added.
Merge pull request #1 from robstewart57/patch-1

Relax dependencies to work with ghc-7.6.3
changed default value of 'Read Sorting' instance from 'Hot' to 'New'
Merge pull request #3 from zudov/cmd_init_with_args

Command line initialization
Added open command to open link in default browser

New 'open' command takes a number argument to open reddit posts in the
users default browser. Needs testing on Windows and Mac OSX. Tested with
Fedora Linux.
Added open command to open link in default browser

New 'open' command takes a number argument to open reddit posts in the
users default browser. Needs testing on Windows and Mac OSX. Tested with
Fedora Linux.
Merge branch 'master' of github.com:robstewart57/hreddit
Use only "start" for opening a URL in Windows