core: fix NoMethodError in Vagrant.has_plugin? [GH-1736]
Updating for NFS Fix
Cleanup for Pull Request
Merge pull request #2189 from phinze/1736-fix-has-plugin-no-method-error

core: fix NoMethodError in Vagrant.has_plugin? [GH-1736]
Update issue reference on CHANGELOG
core: Allow strings to be used when checking for Guest capabilities
clarification: don't -> shouldn't
Call the rest of the middleware stack all the time.
add ansible.host_key_checking configuration parameter
need_configure should return true when master_config is defined as well.

This fixes #2204 and fixes saltstack/salty-vagrant#100
core: Report the proper invalid state when waiting for the guest machine to be ready
Merge pull request #2205 from jcockhren/fix_2204

provisioners/salt: need_configure should return true when master_config is defined as well.
Merge pull request #2203 from copperlight/ansible-host-key-checking

provisioners/ansible: add ansible.host_key_checking configuration parameter
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Merge pull request #2200 from mikerowehl/virtualbox_destroy_unused_interfaces_fix

providers/virtualbox: call rest of destroy middleware stack
Merge branch 'master' of https://github.com/mitchellh/vagrant
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Merge pull request #2195 from tpltnt/locales-fix

core: clarification: don't -> shouldn't
Merge pull request #2191 from Raman148/fix/master/exportssecurity

hosts/bsd: use `sudo` not `su` for NFS export writing
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