Updated readme

Added port option and create command
Added DIR_ROOT to readme
Small updates

Added PORT option
Changed default steam credentials to anonymous
Changed default email to "" to disable it by default
Split up standard and commonly changed command line options, adding a
new option EXTRAPARAMS
Moved some options around and split some options into the 'Advanced
config' section
Small update

Added EXTRAPARAMS option
Moved options to align with the launch script
Merge branch 'addCreate'
testing markup
Fixed formatting issue
Merge remote-tracking branch 'origin/updateReadme'
fixed line endings
fixed line endings
updated line endings

line endings
Added the create command

Added the create command:
Steam can now be automatically installed to DIR_STEAMCMD
It will install Steam, update it, then install the server in the
location specified by $DIR_ROOT
If steamcmd already exists the server is created
If the server already exists it will be updated instead
Changed 'update' to create the log directory automatically to get rid of
some errors
Changed 'update' to create the game directory automatically to get rid
of some errors
Merge remote-tracking branch 'origin/addCreate'
Fixed typo
Merge remote-tracking branch 'origin/addCreate'
Merge pull request #12 from KenMurphy/master

Updated a lot