v1.4

Various small fixes. Bumped two weeks early to incorporate fixes to build problems with v1.3:
https://f-droid.org/wiki/page/cz.martykan.forecastie/lastbuild_15

• Change graphs to float values, rather than integers
• Fix incorrect capitalisation in widget
• Expose hardcoded values so app can be themed more flexibly
• Add zoom control to maps
• Add version number to "About" dialogue
• Fix problems with translations
• Other small fixes such as correcting typos