Release 0.5

See #17, release log:

• 26dd380: #14 added cell border styles
• 1880564: #8 updated javadoc
• e3d3450: #16 added cell styles
• 0210300: #13 added cell styles
• 4d1baab: #15 added logo to readme
• b745ec6: #12 improved code structure

Released by Rultor 1.67.1, see build log