[orion-dev] Updated the Orion/Contributing Code page

[Anthony Hunter <anthonyh@xxxxxxxxxx>]

Hi Team,

I have updated the Contributing code
changes to Orion (for non-committers) page at http://wiki.eclipse.org/Orion/Contributing_Code
.

I have added command line references
to put into context each of the git commands that need to be done in either
Orion or Eclipse, hopefully it all makes sense.

I added a new section http://wiki.eclipse.org/Orion/Contributing_Code#Keeping_up_to_date
with the best practice, Gabriel and myself have been doing these steps.

I also expanded out a new section http://wiki.eclipse.org/Orion/Contributing_Code#Create_a_branch_for_your_work
as it is really important to do your new work in a branch or things get
hard when trying to keep up to date.

I also added a section http://wiki.eclipse.org/Orion/Contributing_Code#Strange_commit:_Merge_remote-tracking_branch_.27upstream.2Fmaster.27
as a note as to why strange "Merge remote-tracking branch" commits
were showing up in my fork and how to clean up. (I did not read the fine
print the first time through and started working in master rather than
creating a branch).

Let me know if any of these changes
could be improved upon.

Cheers...
Anthony