Improve styling

[Jawnnypoo]

This PR:

• Fixes issue with parsing the callback url (caused crash)
• Improves the visual layout of the login dialog, and allows for overriding of XML layout
• Autoformats all files to match standard Android Studio formatting

[codecov]

Codecov Report

Merging #39 into master will decrease coverage by 3.67%.
The diff coverage is 26.14%.

@@             Coverage Diff              @@
##             master      #39      +/-   ##
============================================
- Coverage     30.88%   27.21%   -3.68%     
  Complexity       19       19              
============================================
  Files             3        5       +2     
  Lines           259      294      +35     
  Branches         23       25       +2     
============================================
  Hits             80       80              
- Misses          169      204      +35     
  Partials         10       10

Impacted Files	Coverage Δ	Complexity Δ
...brary/src/main/java/com/parse/twitter/Twitter.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...in/java/com/parse/twitter/OAuth1FlowException.java	0% <0%> (ø)	0 <0> (?)
.../main/java/com/parse/twitter/OAuth1FlowDialog.java	0% <0%> (ø)	0 <0> (?)
...main/java/com/parse/twitter/ParseTwitterUtils.java	30% <28.97%> (ø)	11 <11> (ø)	⬇️
...main/java/com/parse/twitter/TwitterController.java	77.04% <75.43%> (ø)	8 <8> (ø)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d65e6c0...1ba7e4f. Read the comment docs.