Nana Ofosuhene Adane

Check existence of content-type header before using indexOf

2

Closes #94 - prevents an unhandled promise exception from being thrown when a content type isn't provided.

UnhandledPromiseRejectionWarning thrown when content-type is not sent

1

#### Issue summary micro-dev throws the following: ``` (node:29516) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'indexOf' of undefined at logRequest (/home/v3rse/TheFactory/code/learn/javascript/playground/frameworks/micro/hello-micro/node_modules/micro-dev/lib/log.js:38:71) at initLog (/home/v3rse/TheFactory/code/learn/javascript/playground/frameworks/micro/hello-micro/node_modules/micro-dev/lib/log.js:97:23) at /home/v3rse/TheFactory/code/learn/javascript/playground/frameworks/micro/hello-micro/node_modules/micro-dev/lib/log.js:123:2 at resolve (/home/v3rse/TheFactory/code/learn/javascript/playground/frameworks/micro/hello-micro/node_modules/micro/lib/index.js:96:33) at new...