Version 7.4.5

- Dr Michael Henry suggested to change all noremap commands to nnoremap.  Using noremap is unnecessarily broad and can cause problems, especially for select mode.
- Revert change where bufexplorer windows was closed even if the target buffer has not been loaded yet.
- Ivan Ukhov fixed issue with deleting the last window.  This update also fixes as well as another.  If you have say, NERDtree open on the left side and bufexplorer on the right, that bufexplorer would close NERDtree erroneously thinking that it is closing itself.
- Radoslaw Burny fixed a few bugs that surfaced when bufexplorer is used within winmanager.