rename class ecu to Ecu

[ebroecker]

fix typo of exception
more complete #298

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (development@a303dff). Click here to learn what that means.
The diff coverage is 82.35%.

@@              Coverage Diff              @@
##             development    #299   +/-   ##
=============================================
  Coverage               ?   38.5%           
=============================================
  Files                  ?      34           
  Lines                  ?    6895           
  Branches               ?    1690           
=============================================
  Hits                   ?    2655           
  Misses                 ?    4022           
  Partials               ?     218

Impacted Files	Coverage Δ
src/canmatrix/xls.py	10.58% <0%> (ø)
src/canmatrix/kcd.py	5.05% <0%> (ø)
src/canmatrix/dbf.py	4.22% <0%> (ø)
src/canmatrix/canmatrix.py	71.87% <100%> (ø)
src/canmatrix/dbc.py	50.07% <100%> (ø)
src/canmatrix/tests/test_canmatrix.py	100% <100%> (ø)

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