Added Quaternion spheric interpolation

Fixed NzVector(2/3)::Length() and NzQuaternion::Magnitude() returning
double instead of template type
Added quaternion dot product
Added gitignore

.gitignore

@@ -0,0 +1,151 @@
+# Codeblocks
+*.cbp
+*.cscope_file_list
+*.depend
+*.layout
+*.workspace
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+
+# Compiled Dynamic libraries
+*.so
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+
+# Object files
+*.o
+
+# Libraries
+*.lib
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+
+# Executables
+*.exe
+*.out
+
+# Windows image file caches
+Thumbs.db 
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+# User-specific files
+*.suo
+*.user
+*.sln.docstates
+
+# Build results
+
+[Dd]ebug*/
+[Rr]elease/
+
+build/
+
+
+[Tt]est[Rr]esult
+[Bb]uild[Ll]og.*
+
+*_i.c
+*_p.c
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.vspscc
+*.vssscc
+.builds
+
+*.pidb
+
+*.log
+*.scc
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opensdf
+*.sdf
+
+# Visual Studio profiler
+*.psess
+*.vsp
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+
+*.[Rr]e[Ss]harper
+
+# NCrunch
+*.ncrunch*
+.*crunch*.local.xml
+
+# Installshield output folder
+[Ee]xpress
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish
+
+# Publish Web Output
+*.Publish.xml
+
+# Others
+[Bb]in
+[Oo]bj
+sql
+TestResults
+[Tt]est[Rr]esult*
+*.Cache
+ClientBin
+[Ss]tyle[Cc]op.*
+~$*
+*.dbmdl
+
+*.[Pp]ublish.xml
+
+Generated_Code #added for RIA/Silverlight projects
+
+# Backup & report files from converting an old project file to a newer
+# Visual Studio version. Backup files are not needed, because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+
+# NuGet
+packages/