Remove @ensured_* cache variables.

When running different run lists per role, @ensured_* variables are not refreshed, and for example, roundsman thinks it already created /tmp/roundsman, but that's not the case, since we're contacting a different host now. Since the ensure operations are quick and idempotent, no need to go extra mile just to skip them.
make install ruby more similar to install_chef. allow user to opt out of the checks
Create cache/ directory under roundsman_working_directory

Some cookbooks uses cache directory for downloading archives.
but roundsman does not create it on initialize,
then chef got failures on first execution.
Merge pull request #11 from tk0miya/create-cachedir

Create cache/ directory under roundsman_working_directory
Merge pull request #10 from ping4/skip_ruby_checks

skip chef/ruby checks
add missing json dependency
make roundsman work on 1.8.7 again
Bump version to 0.1.1
install_ruby? needs to be available outside the namespace
Merge remote-tracking branch 'upstream/master'

Conflicts:
	lib/roundsman/capistrano.rb
Update lib/roundsman/capistrano.rb

use correct chef version that fixes bug with moneta gem.
Merge pull request #14 from vollnhals/patch-1

Update lib/roundsman/capistrano.rb
Update README.md

typo
Fix false values has been removed on generating solo.json

Some cookbook uses boolean value for customize its behavior.
but remove_procs_from_hash() removes all false values.
Add logging_verbose option to capistrano configuration

chef (>= 0.10.6) supports verbose_logging setting for suppress logs.
This fix makes it changable from capistrano configuration.
Support ruby installed by RVM on user-land (cooperate with rvm-capistrano)
Merge pull request #15 from ryross/patch-1

Update README.md
Merge pull request #16 from tk0miya/fix-false-has-removed-from-solo-json

Fix false values has been removed on generating solo.json
Merge pull request #17 from tk0miya/add-logging_verbose-option

Add logging_verbose option to capistrano configuration
Merge pull request #22 from tk0miya/cooperate-with-rvm-capistrano

Support ruby installed by RVM on user-land (cooperate with rvm-capistrano)