Fix Memdeley issues

1. Word plugin doesn't work in Mac Word 2016
Somehow Word plugin doesn't work in the new version of Mac Word 2016 (ver 15.35). It shows VisualBasic error code and can't insert citation. Before Memdeley provides a bug fix, the only way is to revert to previous version of Word (eg, ver 15.34). It can be downloaded from Microsoft. **Note: Word ver 15.36 has fixed this issue.

2. Memdeley very slow
Memdeley 1.17.x has some issues with Retina display on Mac, which makes it running slow on Mac. The easiest way is revert to ver 1.16.3. The plugin of this version is also compatible with 64bit Mac Word 2016. Then you can enjoy the speedy search and citation.