Issue #2115737 by darol100, owenpm3, rhuffstedtler, andythomnz, jemandy, ijf8090, zealfire, er.pushpinderrana, jhodgdon, corbacho, spitcher, abenamer, holingpoon, ay1n: Make the text in modules, themes, and profiles README.txt files more user-friendly

Issue #2500101 by David_Rothstein: sites/all/modules/README.txt should not imply that clearing caches always works after moving a module to a new subdirectory

Issue #667058 by greggles, DamienMcKenna, cweagans, travelertt, Dave Reid, tstoeckler, geerlingguy: Add a sites/all/libraries folder and encourage people to use it properly

#360415 by JohnAlbin: Ship Drupal with a default sites/all/modules and sites/all/themes directory. Hooraycvs diff :D