Bump CMake minimum requirement to 2.8.0

[Gopalakrishna Bhat]

Hi All,

Considering that CMake 2.8.0[1] was released 3 years back, I propose that
we update our minimum requirement of cmake to 2.8.0. Even our build
server[2] uses cmake 2.8.

This bumping is also made important by the fact that we already use
VERSION_GREATER, VERSION_EQUAL comparisons which was introduced only in
2.8.0[3]

With regards,
Gopalakrishna

[1]
http://www.kitware.com/news/home/browse/CDash%3F2009_11_04%26CMake+2.8.0+Now+Available
[2]
http://158.36.191.251:8080/viewLog.html?buildId=7336&buildTypeId=bt6&tab=buildLog
[3]
http://cmake.3232098.n2.nabble.com/What-CMake-release-introduced-VERSION-LESS-EQUAL-GREATER-td7503879.html


With regards,
Gopalakrishna

-- 
My blog http://gkbhat.blogspot.com
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