Be specific about which exceptions to rescue

The only exception we are expecting is a Mail::Field::ParseError and so this
is the only exception we should rescue from.

Rescuing from other exceptions may mask other problems for example in issue #33
when all emails were being marked as invalid.
Replace `be_true`/`be_false` with `be_truthy`/`be_falsey`

Because `be_true` and `be_false` were deprecated in rspec v2.99, see
https://github.com/rspec/rspec-expectations/blob/master/Changelog.md#2990beta1--2013-11-07
Stop rescuing exceptions in `EmailValidator#validate_each`

Because there don't seem to be any exceptions that we are expecting and would
genuinely want to rescue from.
Remove .rvmrc file

This gem works with most ruby implementations and so it is inappropriate to
specify that development is done in one specific ruby.
Merge pull request #39 from mocoso/stop-rescuing-all-exceptions

Stop rescuing all exceptions
Bump to 0.0.9
Merge pull request #38 from mocoso/be_truthy

Replace `be_true`/`be_false` with `be_truthy`/`be_falsey`
Merge pull request #40 from mocoso/remove-rvmrc

Remove .rvmrc file
Ensure domains that contain spaces are treated as invalid
Merge pull request #41 from mocoso/no-spaces

Ensure domains that contain spaces are treated as invalid
Bump to 0.0.10
Remove unnecessary &&=’s

These are not required because in each case we already check that
the current value for the result is true before setting it.