Adds caveats section to README

Added to announce the issue described in issue #15
Issue #18. Fixed '<SNR>75_MoveCursor()...' error.

Fix for the issue #18.
Merge pull request #21 from hinikato/patch-1

Issue #18. Fixed '<SNR>75_MoveCursor()...' error. This closes #20 as it has a newer fix.
Bumps version to 1.10.1
Fix the issue #22

https://github.com/sukima/xmledit/issues/22
Merge pull request #23 from szw/master

Fix for the issue #22
Bumps version to 1.10.2
Mapping LocalLeader+. or > for different map

This allows you to change the `g:xml_tag_completion_map`
setting but still easily type the mapped character
using the `<LocalLeader>` syntax that types > when
there is no such map.
Merge pull request #24 from ajcrites/tag_completion_remap

Mapping LocalLeader+. or > for different map
Bumps version to 1.10.3
Removes rvmec and updates Gemmfiles
Adds Rakefile
Fixes paths and spec_helper
Adds travis.yml
Merge branch 'master' into tests
Adds testing docs to README