boot2docker 0.7.0

Closes #27523.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
json-c: add 0.11 bottle.
gsl: add 1.16 bottle.
sdl2: add 2.0.2 bottle.
gawk: add 4.1.0 bottle.
xerces-c: add 3.1.1 bottle.
asciidoc: add 8.6.9 bottle.
s-lang: add 2.2.4 bottle.
gnu-getopt: add 1.1.5 bottle.
wemux 3.2.0

"Security" update. Documentation improvements. Better command lane argument passing.
wemux: update 3.2.0 bottle.

Closes #27520.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Add ARGV.env
Don't set installer options to their default

ignore_deps and show_header default to false.
Whitelist arguments that are passed to build process
Remove unnecessary check for pour_bottle?

@start_time will be nil if we're pouring a bottle, so we don't need to
also check pour_bottle?.
Add predicate methods for inspecting the installer mode
Make interactive an installer mode
Make verbose an installer mode
Make debug an installer mode
Make FormulaInstaller setup more readable