FIX some problems which lead to jekyll build error

	the build errors all like this when I update jekyll from 1.2.1
	to 1.3.0:

		$ jekyll -t build -d _site
		Configuration file: d:/OpenCourses/swc/2013-10-17-round6.4/_config.yml
					Source: d:/OpenCourses/swc/2013-10-17-round6.4
			   Destination: _site
			  Generating... [31m  Liquid Exception: Included file 'guide-invperc/profile/objectives.html' n
		ot found in '_includes' directory in _includes/guide-invperc/profile/objectives.html[0m
		c:/Ruby193/lib/ruby/gems/1.9.1/gems/jekyll-1.3.0/lib/jekyll/tags/include.rb:106:in `rescue in render
		': Included file 'guide-invperc/profile/objectives.html' not found in '_includes' directory (Jekyll:
		:Tags::IncludeTagError)
				from c:/Ruby193/lib/ruby/gems/1.9.1/gems/jekyll-1.3.0/lib/jekyll/tags/include.rb:90:in `rend
		er'
				from c:/Ruby193/lib/ruby/gems/1.9.1/gems/liquid-2.5.2/lib/liquid/block.rb:137:in `block in r
		ender_all'

	so I fix them one by one:

	modified:   _includes/guide-invperc/grid/challenges.html
	new file:   _includes/guide-invperc/assembly/title.md
	renamed:    _includes/guide-invperc/profile/obejctives.html -> _includes/guide-invperc/profile/objectives.html
	new file:   _includes/guide-invperc/test/title.md

	detailed discussion here: #141 #142