Check to see if HeaderView is attached before removing. Closes #165
v0.9.2 Release
New Development Version
Throw Exception if we're not passed an Activity. Closes #170.
Revert removeViewImmediate() change. Closes #179
Ensure the Header View is displayed at the correct location

Mainly for system ui visibility changes. Closes #169 and #174.
Remove unnecessary Handler instance
Small code formatting fixes
Allow setting refreshable views via the object rather than ID.

Will close #162.
Merge branch 'development' into progress_in_layout