provisioners/ansible: refer to inventory directory

By referring the directory that contains the generated inventory file,
users can easily provide more settings with additional files stored in
the same directory.
print version when removing a specific box

Example:

$ vagrant box remove --box-version 0.2.9 berendt/ubuntu-14.04-amd64
Removing box 'berendt/ubuntu-14.04-amd64' with provider 'virtualbox' in version '0.2.9'...
fixed spelling
sort versions and print them as listing

before this patch:

```
$ vagrant box remove --box-version 0.2.9 berendt/ubuntu-14.04-amd64
You requested to remove the box 'berendt/ubuntu-14.04-amd64' version '0.2.9' with
provider 'virtualbox', but that specific version of the box is
not install. Please double-check and try again. The available versions
for this box are:

0.2.11, 0.2.10
```

after this patch:

```
You requested to remove the box 'berendt/ubuntu-14.04-amd64' version '0.2.9' with
provider 'virtualbox', but that specific version of the box is
not install. Please double-check and try again. The available versions
for this box are:

 * 0.2.10
 * 0.2.11
```
Merge pull request #3440 from berendt/fixing_typo_001

fixed spelling
Merge pull request #3438 from berendt/show_version_when_removing_a_specific_box

print version when removing a specific box
Nitpick on messaging
Merge pull request #3441 from berendt/sort_versions_and_print_listing

commands/box/remove: sort versions and print them as listing
core: No need to map! here
add translation message for docker building images
Merge pull request #3445 from Mulkave/fix/master/missing-translation-docker-building-images

add missing translation message for docker_building_images
style
communicators/ssh: only show warnings after a few attempts [GH-3442]
Print message and exit rsync-auto immediately if there is nothing to watch.
Merge pull request #3446 from brenttheisen/rsync_auto_nothing_to_watch_pr

command/rsync-auto: message and exit rsync-auto immediately if there is nothing to watch.
synced_folders/rsync: change wording on no paths watching
Update CHANGELOG
Last bug fix is actually an improvement
communicators/ssh: throttle warnings [GH-3442]
core: all symlinks for synced folders are expanded [GH-3444]