fix for FB #4763, refactorings in AzureVM and AzureOSImage to replace xml string builder with serialzation
Revert "fix for FB #4763, refactorings in AzureVM and AzureOSImage to replace xml string builder with serialzation"

This reverts commit dae6f57736ffa78ba0dcbe3b509b750635a68f88.
add http proxy support via System properties
rename get proxy config data method
update http proxy parameter names
Merge pull request #92 from vladmunthiu/2014.08

http proxy support via System properties
updated azure products
Merge pull request #98 from vladmunthiu/2014.08

updated azure products
updates on Azure image to use latest API changes. some refactorings in AzureOSImage and AzureVM to use serialization instead of xml string building/parsing
Merge pull request #101 from vladmunthiu/2014.08

updates on Azure image to use latest API changes