added cmake to osx brew instructions
Add sodium/ to .gitignore

Because Windows devs.
Move start_guide.md to docs/ and delete using_tox.md

`start_guide.md` is virtually an exact duplicate of `using_tox.md`.
Add nicknames to the chat list

Change from [chat <number>] to [<nickname> (<number>)]
Update start_guide.md

Fixed a spelling mistake.
Update start_guide.md

More edits.
mac on homepage
mac on homepage
add cmake to brew packages
Use print_usage for help command
Merge pull request #236 from CharmlessCoin/network

Add get_broadcast()
Merge pull request #237 from chovy/master

Add Mac OSX instructions
Merge pull request #235 from bigfack/master

Update start_guide.md
Merge pull request #231 from KenanY/gitignore-sodium

Add sodium/ to .gitignore
Merge pull request #233 from Spittie/patch-1

Add nicknames to the chat list
Merge pull request #238 from clpr/master

Use print_usage for help command
Merge pull request #230 from justquick/master

OSX Homebrew Install Doc Fix
Merge branch 'useless-start-guide' of https://github.com/KenanY/ProjectTox-Core into KenanY-useless-start-guide
Fixed possible issues with the crypto reported by an anonymous person.
Removed code that didn't work.