Fix download message/rfc822 attachments with no file name

[fukusuket]

Fixes #26

Changes proposed in this pull request:

• Save attachments that meets the following conditions.
  • Content-Type is message/rfc822
  • Content-Disposition has no file name.
• Save file name format is [system nanotime].eml

[codecov[bot]]

Codecov Report

Merging #55 into master will increase coverage by 1.23%. The diff coverage is 28.57%.

@@             Coverage Diff              @@
##             master      #55      +/-   ##
============================================
+ Coverage     64.93%   66.17%   +1.23%     
- Complexity      149      153       +4     
============================================
  Files            15       15              
  Lines           750      742       -8     
  Branches         99       98       -1     
============================================
+ Hits            487      491       +4     
+ Misses          225      210      -15     
- Partials         38       41       +3

Impacted Files	Coverage Δ	Complexity Δ
...ugins/pollmailboxtrigger/mail/utils/Stringify.java	75.22% <ø> (+1.83%)	46 <0> (+2)	:arrow_up:
...ollmailboxtrigger/mail/utils/MailWrapperUtils.java	72.72% <28.57%> (+5.7%)	0 <0> (ø)	:arrow_down:
...kinsci/plugins/pollmailboxtrigger/SafeJenkins.java	55.17% <0%> (-5.44%)	12% <0%> (ø)
.../plugins/pollmailboxtrigger/mail/utils/Logger.java	72.97% <0%> (+0.75%)	5% <0%> (ø)	:arrow_down:
...plugins/pollmailboxtrigger/PollMailboxTrigger.java	65.9% <0%> (+0.94%)	37% <0%> (+2%)	:arrow_up:

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