New option company-continue-invalidated-if-manual

For manually started completions, backspacing too a prefix shorter than
company-minimum-prefix-length usually still shows completions.  Setting the new
option to nil (default is t) turns that off, so that completions disappear
whenever your prefix gets too short.
New option company-etags-ignore-case

When t, find tags candidates case-insensitively
Use company-dabbrev-code-ignore-case when finding candidates