Response reset size

[CaptainCodeman]

Very minor but the logged response size accumulated with each request producing the following for the 'hello world' example (note last column):

2015/05/27 20:46:49 GET / 200 0 14
2015/05/27 20:46:49 GET / 200 0 28
2015/05/27 20:46:49 GET / 200 0 42
2015/05/27 20:46:50 GET / 200 0 56

Setting the size to 0 when the response is reset produces the expected result:

2015/05/27 20:49:13 GET / 200 0 14
2015/05/27 20:49:14 GET / 200 0 14
2015/05/27 20:49:14 GET / 200 0 14
2015/05/27 20:49:14 GET / 200 0 14

[coveralls]

Coverage increased (+0.02%) to 81.66% when pulling 87b24d3 on CaptainCodeman:response-size into 4159cef on labstack:master.

[vishr]

@CaptainCodeman Thanks, do you mind joining gitter chat for future communication?