Mo' colors

Changes:
- Stream is colored now
- Stream is formatted
- Stream has it's own formatting option
- Colors are now a style, and is a struct
- Color struct has a pretty cool functional interface
- colored mentions and PMs
- Every message uses the same function (it's dry!!)
- Colorize errors!
- Create function for visualizing errors
- colorized some of the command output!
- Color is stored in a Style
- Create a Text struct that can use to stylize strings "easily"
- Text can be used to build strings
- color highlighting on code
- added tml config support
- added different color for mention url
- Added sprintf to use formatting with PrintFeed and PrintError

Known Bugs: (added as todos whereever)
- Cannot use multiple formatting at the same time (*bold _italic_*
doesn't work
- sprintf is pretty shit
- background doesn't cover as a `block` in codeblocks
- not possible to escape sprintf thing

cmdJoin.go

@@ -41,12 +41,12 @@ func cmdJoin(cmd []string) {
 			channel.TopicName = ""
 			channel.MembersType = keybase.USER
 		}
-		printToView("Feed", fmt.Sprintf("You are joining: %s", joinedName))
+		printInfoF("You are joining: $TEXT", messageLinkKeybaseColor.stylize(joinedName))
 		clearView("Chat")
 		setViewTitle("Input", fmt.Sprintf(" %s ", joinedName))
 		go populateChat()
 	default:
-		printToView("Feed", fmt.Sprintf("To join a team use %sjoin <team> <channel>", cmdPrefix))
-		printToView("Feed", fmt.Sprintf("To join a PM use %sjoin <user>", cmdPrefix))
+		printInfo(fmt.Sprintf("To join a team use %sjoin <team> <channel>", cmdPrefix))
+		printInfo(fmt.Sprintf("To join a PM use %sjoin <user>", cmdPrefix))
 	}
 }