[PATCH 1 of 8] filectx: add a repo accessor

[Ryan McElroy]

On 3/13/2015 6:28 PM, Matt Harbison wrote:
> # HG changeset patch
> # User Matt Harbison <matt_harbison at yahoo.com>
> # Date 1426293292 14400
> #      Fri Mar 13 20:34:52 2015 -0400
> # Node ID 0467e262cc72c4c9037ef2ddcf4c51f89c367fea
> # Parent  15afda349b11b531edd1ea6ec02847e01fe35615
> filectx: add a repo accessor
>
> This is similar to a07314472a80 in motivation.  All contexts now have this
> method, so the rest of the 'ctx._repo' uses can be converted without worrying
> about what type of context it is.
>
> <snip>

This series looks well-structured and is a nice incremental improvement. 
ryanmce-approved!