Add a Version class and matching unit tests, roughly based on chrome/installer/util/version.*.  This version has more flexible parsing rules and is more robust to detecting bogus versions, supporting arbitrary numbers of version components rather than just dotted quads.  It's possible that we should switch chrome installer to use this version.
Review URL: http://codereview.chromium.org/19667

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8901 0039d316-1c4b-4281-b951-d872f2087c98

• base/base.xcodeproj/project.pbxproj[diff]
• base/base_lib.scons[diff]
• base/base_unittests.scons[diff]
• base/build/base.vcproj[diff]
• base/build/base_unittests.vcproj[diff]
• base/version.cc[Added - diff]
• base/version.h[Added - diff]
• base/version_unittest.cc[Added - diff]