Add link-grammar version checking

The FindLinkGrammar.cmake file failed to check version numbers
Merge pull request #159 from linas/lg

Add link-grammar version checking fix issue #158
add missing include file

The build broke because this was missing...
Merge pull request #161 from linas/examples

add missing include file
 #nd documentation slightlyPlease enter the commit message for your changes. Lines starting
fix bad whitespace/indentation
Merge pull request #162 from linas/documentation

Documentation