Added Gentoo support for timezone module
Update doc/ref/peer.rst

Fix typo
Pass on the given env
Merge pull request #3153 from shadowfax-chc/timezone

Added Gentoo support for timezone module
Update doc/topics/event/index.rst

default sock_dir was changed. Updated this doc to work with new location.
Added makeconf module

Manages setting values in the Gentoo make.conf file
Merge pull request #3154 from torhve/develop

Pass on the given env
Added functions to append and trim vars in makeconf
Added cflags functions to modify cflags variable
Made var_contains actually work
Added functions for common variables in make.conf
Added docs for makeconf module
Fixed bug in layman.list_local

If no overlays had been added, layman.list_local would fail with
IndexError
Updated layman.add and layman.delete to adjust make.conf

When the first overlay is added, the make.conf needs to source layman's
make.conf so that emerge sees the packages in the overlay. Likewise,
when the last overlay is deleted, the make.conf needs to no longer
source layman's make.conf as it will cause emerge to break.
Merge pull request #3160 from shadowfax-chc/layman

Layman bug fixes
Merge pull request #3159 from shadowfax-chc/makeconf

Makeconf