Merge pull request prometheus#521 from prometheus/bjk/0.14.0

Release v0.14.0

Merge pull request prometheus#441 from prometheus/superq/v0.14.0-rc.2

Release v0.14.0-rc.2

Merge pull request prometheus#423 from prometheus/superq/v0.14.0-rc.1

Release v0.14.0-rc.1.

Merge pull request prometheus#336 from prometheus/superq/v0.13.0

Release v0.13.0

Merge pull request prometheus#348 from prometheus/superq/v0.13.0-rc.2

Release v0.13.0-rc.2

Merge pull request prometheus#348 from prometheus/superq/v0.13.0-rc.2

Release v0.13.0-rc.2

Merge pull request prometheus#313 from prometheus/superq/v0.13.0rc1

Prepare for 0.13.0-rc.1 release.

0.12.0 / 2016-05-05

* [CHANGE] Remove lastlogin collector.
* [CHANGE] Remove -debug.memprofile-file flag.
* [CHANGE] Sync BSD filesystem collector labels with Linux.
* [CHANGE] Remove HTTP Basic Auth support.
* [FEATURE] Add -version flag.
* [FEATURE] Add Linux logind collector.
* [FEATURE] Add Linux ksmd collector.
* [FEATURE] Add Linux memory NUMA collector.
* [FEATURE] Add Linux entropy collector.
* [FEATURE] Add Linux vmstat collector.
* [FEATURE] Add Linux conntrack collector.
* [FEATURE] Add systemd collector.
* [FEATURE] Add OpenBSD support for filesystem, interrupt and netdev collectors.
* [FEATURE] Add supervisord collector.
* [FEATURE] Add Linux /proc/mdstat collector.
* [FEATURE] Add Linux uname collector.
* [FEATURE] Add Linux /proc/sys/fs/file-nr collector.
* [FEATURE] Add Linux /proc/net/sockstat collector.
* [IMPROVEMENT] Provide statically linked Linux binaries.
* [IMPROVEMENT] Remove root requirement for FreeBSD CPU metrics.
* [IMPROVEMENT] Add node_exporter build info metric.
* [IMPROVEMENT] Add disk bytes read/written metrics on Linux.
* [IMPROVEMENT] Add filesystem read-only metric.
* [IMPROVEMENT] Use common Prometheus log formatting.
* [IMPROVEMENT] Add option to specify NTP protocol version.
* [IMPROVEMENT] Handle statfs errors gracefully for individual filesystems.
* [IMPROVEMENT] Add load5 and load15 metrics to loadavg collector.
* [IMPROVEMENT] Add end-to-end tests.
* [IMPROVEMENT] Export FreeBSD CPU metrics to seconds.
* [IMPROVEMENT] Add flag to configure sysfs mountpoint.
* [IMPROVEMENT] Add flag to configure procfs mountpoint.
* [IMPROVEMENT] Add metric for last service state change to runit collector.
* [BUGFIX] Fix FreeBSD netdev metrics on 64 bit systems.
* [BUGFIX] Fix mdstat for devices in delayed resync state.
* [BUGFIX] Fix Linux stat metrics on parallel scrapes.
* [BUGFIX] Remove unavailable collectors from defaults.
* [BUGFIX] Fix build errors on FreeBSD, OpenBSD, Darwin and Windows.
* [BUGFIX] Fix build errors on 386, arm, arm64, ppc64 and ppc64le architectures.
* [BUGFIX] Fix export of stale metrics for removed filesystem and network devices.
* [BUGFIX] textfile: Fix mtime reporting.
* [BUGFIX] megacli: prevent crash when drive temperature is N/A

And one more, because I don't know how to version.

Update Makefile.COMMON

Go expects to build a project from a location like
`.../src/github.com/prometheus/node_exporter`.