Bugfix Cast nil field (#84)

fix error handler on WrapNew/NopLogger cause nil pointer exception (#81)

exclude syslog on windows platform (#76)

Add conditional context and color on default formatter (#75)

* Add conditional context and color on default formatter

* fix test

fixup context key collision (#74)

Add the forgotten license :)

Fix field marshaller (#73)

Fix caller depth when using .Log method (#72)

Fix testing in memory logger race condition (#70)

* Fix testing in memory logger race condition

* add test race condition

Update mocks accordling to logger signature change (#69)