Add support for .dockercfg files to handle auth for push command
list filtered images as described in the remote api docs
send 'filters' parameter only if needed
Merge branch 'gesellix-docker-image-filters't push origin master
Merge branch 'master' of https://github.com/signalfx/docker-java into signalfx-master
Merge branch 'signalfx-master't push origin master
Make GoLangMatchFileFilter work on Windows

Without this,
BuildImageCmdImplTest.testDockerBuilderAddFolder()
and BuildImageCmdImplTest.testDockerIgnore() both fail with

java.util.regex.PatternSyntaxException: Illegal/unsupported escape
sequence near index 3
D:\Eclipse\Jenkins\docker-java\target\test-classes\testDockerignore\a\
   ^
	at java.util.regex.Pattern.error(Pattern.java:1924)
	at java.util.regex.Pattern.escape(Pattern.java:2416)
	at java.util.regex.Pattern.atom(Pattern.java:2164)
	at java.util.regex.Pattern.sequence(Pattern.java:2097)
	at java.util.regex.Pattern.expr(Pattern.java:1964)
	at java.util.regex.Pattern.compile(Pattern.java:1665)
	at java.util.regex.Pattern.<init>(Pattern.java:1337)
	at java.util.regex.Pattern.compile(Pattern.java:1022)
	at java.lang.String.replaceFirst(String.java:2119)
	at
com.github.dockerjava.core.GoLangMatchFileFilter.accept(GoLangMatchFileFilter.java:26)
	at
org.apache.commons.io.filefilter.AndFileFilter.accept(AndFileFilter.java:122)
	at
org.apache.commons.io.filefilter.OrFileFilter.accept(OrFileFilter.java:118)
	at java.io.File.listFiles(File.java:1285)
Merge pull request #103 from albers/golangmatch-filefilter

Make GoLangMatchFileFilter work on Windows
New enum for capabilites
InspectContainerResponse returns capabilites as enum constants
StartContainerCmd uses Capability enum
Add CapAdd and CapDrop to CreateContainerCmd [fails]

com.github.dockerjava.core.command.CreateContainerCmdImplTest.createContainerWithCapAddAndCapDrop()
fails because Docker API 1.15 expects CapAdd and CapDrop inside an
HostConfig element.
Move CapAdd and CapDrop to nested HostConfig
Now CreateContainerCmd.withDns() fails

because its setting is overridden by the HostConfig.
Move Dns to nested HostConfig