Add contact to address book when composing mail.

[tonioo]

see #100

[codecov]

Codecov Report

Merging #141 into master will increase coverage by 0.03%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
+ Coverage   74.32%   74.35%   +0.03%     
==========================================
  Files          23       23              
  Lines        2029     2028       -1     
==========================================
  Hits         1508     1508              
+ Misses        521      520       -1

Impacted Files	Coverage Δ
modoboa_webmail/lib/imapemail.py	66.22% <0%> (+0.28%)	⬆️

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