Updates lesshat mixins to v2.0.15
Updates bootswatch to v3.1.1+1
Number of bootstrap3/NEWUI tweaks & fixes: better integration of newui styles in base bootstrap3 removing newui as an option from bootstrap2 and making it work better with non-bootstrap themes; fixes a great number of display anomalies; moves lesshat to external; moves newui.less to external/bootstrap3; moves the newui controls to inside the controls folder in newui subfolder;