[RFC]vim-patch:7.4.336

Problem:    Setting 'history' to a big value causes out-of-memory errors.
Solution:   Limit the value to 10000. (Hirohito Higashi)

https://code.google.com/p/vim/source/detail?r=a42ba1e5099290a86cac1a9ac490c49e82e4c2cf

This is my first contribution. Apologies if I made any mistakes.