Release 2.7.0

• [feature] Integrating clib-uninstall as clib uninstall command (#245)
• [feature] Integrating clib-validate to automatically validate clib.json files (#242)
• [deprecated] Deperecated clib-* executable plugins (#244)
• [fix] clib init can't always determine the current directory name (#240)
• [fix] memory leak in clib.c (353834e)