Made fields in Har objects final or volatile to avoid memory consistency effects when populating from other threads
Merge branch 'har-tests' into littleproxy

Conflicts:
	src/main/java/net/lightbody/bmp/core/har/HarPostData.java
	src/main/java/net/lightbody/bmp/core/har/HarRequest.java
WIP: made timing fields in HarCaptureFilter volatile, since they can be populated by other threads
Changed HarTest.testSendTimingPopulated() to POST to the internet, to increase the likelihood of getting send times > 1ms
Merge branch 'har-tests' into littleproxy
WIP: made har send time less inaccurate, but still not exact due to littleproxy limitation