Changelog. Bump version to v1.0.3

Improvements.

Resolve conflicts.

Removed unnecessary GTM commit.

develodesign#114 Added support the style attribute for any buttons cu…

…stomizations.

Added loader for the place order process. Backward compatibility for …

…get totals.

develodesign#107 Updated the module signatura - compatibility with VS…

…F 1.10.x.

Merge pull request develodesign#105 from benjick/patch-2

Add currencyCode to SDK URL

develodesign#103 Setup currency code for purchase.

Bump version 0.6.0