Add skip validation for checks and add workaround for alert parameters

[mohabusama]

Fix #52 Fix #51

[codecov[bot]]

Codecov Report

Merging #53 into master will decrease coverage by 0.21%. The diff coverage is 60%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
- Coverage    74.8%   74.58%   -0.22%     
==========================================
  Files          19       19              
  Lines        1020     1027       +7     
==========================================
+ Hits          763      766       +3     
- Misses        257      261       +4

Impacted Files	Coverage Δ
zmon_cli/client.py	98.29% <100%> (ø)	:arrow_up:
zmon_cli/cmds/check.py	83.56% <100%> (+0.22%)	:arrow_up:
zmon_cli/cmds/alert.py	64.44% <20%> (-2.62%)	:arrow_down:

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[elauria]

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[mohabusama]

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