Merge pull request #490 from quicksketch/352/avoid_config_install

Issue #352: Upgrade paths should not use config_install_default_config().
Issue #357: Add 'Cancel' link on node forms.
Issue #318: Rename comment's 'Subject' to 'Title' in the UI.
Merge pull request #493 from BWPanda/357/cancel_button_for_nodes

Issue #357: Add 'Cancel' link on node forms.
Merge pull request #495 from BWPanda/318/rename_comment_subject_to_title

Issue #318: Rename comment's 'Subject' to 'Title' in the UI.
#365 Removed icons from core that are no longer in use

Deleted icons
- drupalicon.png
- forum-icons.png
Issue #377: Fixes URL path bug introduced in #357.
Merge pull request #498 from BWPanda/377/fix_path_bug

Issue #377: Fixes URL path bug introduced in #357.
Merge pull request #497 from dgoutam/#365-remove-unused-icons-from-core

Issue #365: Removed icons from core that are no longer in use.
Issue #375: Fixing links to handbook.
Issue #86: Introducing Layout module, providing multiple site-wide layouts, contexts, and individual block settings.
Merge pull request #483 from quicksketch/86/layout_pr

Issue #86: Introducing Layout module, providing multiple site-wide layouts, contexts, and individual block settings.
Issue #171: Convert node types to use config files.