experimental branch
lowering minimum SDK, now depending to android support lib
build.gradle update to fix dependency to specified version (gradle speed increase)
build.gradle remove dependency (gradle speed increase)
Revert "lowering minimum SDK, now depending to android support lib"

This reverts commit 41138cc95faece6f1862a5117e5a09f4abfd9bfc.
Merge branch 'experimental' of https://github.com/yunarta/works-http-cache into experimental
8cc95faece6f1862a5117e5a09f4abfd9bfc.

Conflicts:
	library/build.gradle
fix commit and fix gradle
changed error code to hex format
added support for v4
empty parameter values will not be added to post param
preparation for samples
update on copyright
build.gradle updated
samples
content updated