Added interface UrlContentProvider and its default (yet empty) implementation UrlConnectionContentProvider to open InputStream for given URL
Added tests for UrlConnectionContentProvider.java to check it can access local and external resources
Added default implementation UrlConnectionContentProvider of UrlContentProvider
Merge remote-tracking branch 'origin/content-provider' into content-provider-interface
Added tests for UrlConnectionContentProvider.java to check it can access resources which require User-Agent request header - so, test that request-property has been passed
Added HtmlExtractor.urlContentProvider to add ability of customization of content provider. Deprecated methods: HtmlExtractor#addRequestProperty and HtmlExtractor#getHttpRequestProperties
Added IOUtils as helper for i/o operations
Merge remote-tracking branch 'origin/content-provider' into content-provider-interface
updated pom version to 0.9.9
Updated javadocs
Merge remote-tracking branch 'origin/content-provider' into content-provider-interface

Conflicts:
	pom.xml
Merge pull request #78 from ontometrics/content-provider

Content provider