emerge: fix invalid locale setting (bug 519074)

Don't die when the user has an invalid locale setting.
Resolves bug 519074.
emake: pass EXTRA_EMAKE after user's "$@", not before

Patch allows easier override or ebuild things, like
    #foo-9999.ebuild:
    src_compile() {
        emake V=1
    }

    EXTRA_EMAKE="V=0" emerge =foo-9999

That way it's easier to eyeball upstream builds for new warnings.

This behaviour is more in line with EXTRA_ECONF variable.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
repoman: Do not report DESCRIPTION.punctuation warning for "etc.".
emerge: Prepend '=' to unmerge atoms (bug 512578)

Signed-off-by: Alexander Berntsen <bernalex@gentoo.org>
Reviewed-By:   Brian Dolbec       <dolsen@gentoo.org>
Reviewed-By:   Michał Górny       <mgorny@gentoo.org>
Enable consistent __future__ behavior for division

In Python 2, the division ('/') operator defaults to integer
(truncating) division when given integer argument. In Python 3, it
performs floating-point division unconditionally instead. To overcome
this difference and get a consistent behavior, integers were converted
to floats explicitly in a few places.

Instead, use a simpler 'from __future__ import division' statement that
enables floating-point division globally in Python 2. Use it in all
relevant files to get a consistent behavior, and use '//' appropriately
whenever integer division is desired.

Reviewed-by: Arfrever Frehtes Taifersar Arahesis <Arfrever@Apache.Org>
Acked-by: Alexander Berntsen <bernalex@gentoo.org>
Acked-by: Brian Dolbec <dolsen@gentoo.org>
QA: Use pngfix to find broken PNG files

Acked-by: Alexander Berntsen <bernalex@gentoo.org>
Acked-by: Brian Dolbec <dolsen@gentoo.org>
Reviewed-by: Justin Lecher <jlec@gentoo.org>
Reviewed-by: Sergei Trofimovich <slyfox@gentoo.org>
QA: Warn when systemd units use /etc/conf.d

Acked-by: Alexander Berntsen <bernalex@gentoo.org>
Acked-by: Brian Dolbec <dolsen@gentoo.org>
Reviewed-by: Anthony G. Basile <blueness@gentoo.org>
Enable testing using travis-ci

Make it easy to use travis-ci for testing on github mirror and forks.