fix https://github.com/daviferreira/medium-editor/issues/220
Verifies if seletedParentElement.tagName is not undefined
Merge with master
Updates css minified files
Removes placeholder for elements with images, fixes #223
Fixes checkActiveButton parentElement
Removes console.log
Checks for selection after creating a link
Revert "Checks for selection after creating a link"

This reverts commit 3c65d72c12ca0b18c9f49fd75120a4198abc3867.
Revert "Revert "Checks for selection after creating a link""

This reverts commit c013098ffe645cd3687c29f7dd8ce5d82cbc409b.
Updates css minified files
add strong url validation and stop add empty link
merge with upstream
Merge pull request #12 from OmniaGM/strong-link-validation

Strong link validation