Ignore non-zero exit code from installation.
Warn the user if an error occurred during installation.
Fix syntax error.
prepare next dev version
Ensure dependencies are installed under redhat VMs

Tested against Scientific Linux 6.

Resolves https://github.com/dotless-de/vagrant-vbguest/issues/45
removing vim modeline as requested
note redhat support in changelog
Merge pull request #44 from jimmycuadra/ignore-exit-code

Failing guest installer will no longer stop vagrant but print a nice waring message and than carry on with good faith.
attribute author of redhat support
fix markdown syntax error
Note #44 in changelog

also note where this change might be breaking things
loosening iso matching to allow the version number

Fixes issue: https://github.com/dotless-de/vagrant-vbguest/issues/48
Merge pull request #49 from neerolyte/use_ubuntu_isos

loosening iso matching to allow the version number
proper regex escape the '.' in a filename

don't open a regex group for the guest version in a filename
Allow multiple places on host system to be searched for iso file
Add additional check for windows environment variables when searching iso file
Note recent updates in changelog