new json problems
energy balance 8 has been added as authentic set 6th problem
Updated description for set 1 problems
Updated description and lessonsLearned for set 2 problems
Updated description and lessonsLearned for set 3 problems
Updated description and lessonsLearned for set 4 problems
Updated description and lessonsLearned for set 5 problems
updated student infections json
Merge branch 'master' into sachin

Conflicts:
	www/problems/CPI-2014-ps1-01.json
	www/problems/CPI-2014-ps1-02.json
	www/problems/CPI-2014-ps1-03.json
	www/problems/CPI-2014-ps1-04.json
	www/problems/CPI-2014-ps1-06.json
	www/problems/CPI-2014-ps1-11.json