carrier mail functionality

[begunrom]

Implements processing of a carrier mail that contains email attachments. Each email attachment is converted into an individual MISP event.

[coveralls]

Pull Request Test Coverage Report for Build 48

• 6 of 20 (30.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-2.5%) to 63.043%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
mail2misp/mail2misp.py	6	20	30.0%

Totals
Change from base Build 47:	-2.5%
Covered Lines:	203
Relevant Lines:	322

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 48

• 6 of 20 (30.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-2.5%) to 63.043%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
mail2misp/mail2misp.py	6	20	30.0%

Totals
Change from base Build 47:	-2.5%
Covered Lines:	203
Relevant Lines:	322

---

💛 - Coveralls

[codecov]

Codecov Report

Merging #38 into master will decrease coverage by 2.53%.
The diff coverage is 30%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   65.57%   63.04%   -2.54%     
==========================================
  Files           4        4              
  Lines         305      322      +17     
==========================================
+ Hits          200      203       +3     
- Misses        105      119      +14

Impacted Files	Coverage Δ
mail2misp/mail2misp.py	61.73% <30%> (-2.55%)	⬇️

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[lgtm-com]

This pull request introduces 1 alert when merging 26ef177 into d747ede - view on LGTM.com

new alerts:

• 1 for Except block handles 'BaseException'