Initial commit of documentation source.
Don't build 'docs' branch
More work on documentation -- installation of ReproZip.
Ongoing work on documentation -- packing experiments.
Merge branch 'docs' of github.com:ViDA-NYU/reprozip into docs
Ongoing work on documentation:

- Added Python 2.7.3 to software dependencies
- More work on packing experiments
Ongoing work on docs: packing experiments.
Just bail out if using Python < 2.7.3

It has been confirmed that reprozip will NOT work, as it is unable to
read trace.sqlite3. 2.7.3 was released in Aug 2012 and is included in
Debian 7.0 Wheezy, so people shouldn't be using these versions anyway.

Working around that bug would mean changing the way I store arrays,
which would need some kind of escaping of a chosen character, and would
break packfile compatibility.
Merge branch 'docker' into 'master'
Moves buildpkgs.py to scripts/
Adds a script testing for bug 13676
Updates CHANGELOG

[skip ci]
Finished packing section.
Merge branch 'master' of github.com:ViDA-NYU/reprozip into docs
Changes to Packing.
Work on unpacking documentation.
Ongoing work on documenting the unpacking step.
Fixes READ_THEN_WRITTEN warning
Ongoing work on documenting the unpacking step.
Fixes socketcall()